Rennen Plus

Rennen by JSR Individual Throttle Bodies (ITB) Upgrade for Modified Porsche 964 4.0ltr Engine

Developed for serious air-cooled Porsche performance builds, the Rennen by JSR Individual Throttle Bodies (ITB) Upgrade Kit for the Porsche 964 4.0ltr engine delivers exceptional airflow, lightning-fast throttle response and a true motorsport-inspired driving experience. Specifically configured for modified 4.0ltr engines featuring 45mm inlet bores and 50mm internal diameter Velocity Stacks, this induction package has been engineered to support the increased airflow demands of high-output naturally aspirated engine builds.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

This premium specification combines Gun Metal Individual Throttle Bodies, 50mm Silver Velocity Stacks, the Rennen Classic Mesh and Foam Air Filter Set and a Mechanical Throttle Linkage System, creating one of the most capable and visually impressive induction systems available for the Porsche 964 platform.

Whether fitted to a fast-road build, high-end restomod, track-focused machine or bespoke engine project, this system transforms the character of the Porsche flat-six while maximising its performance potential.

Designed for Modified 4.0ltr Engines

This ITB system has been developed specifically for enlarged-capacity Porsche 964 engines built to 4.0ltr and featuring 45mm inlet bores.

The larger bore specification provides:

• Increased airflow capacity
• Improved cylinder filling
• Enhanced high-RPM breathing
• Greater power potential
• Improved volumetric efficiency
• Enhanced throttle response
• Optimised compatibility with performance cylinder heads and camshafts

Combined with the 50mm velocity stack configuration, the system supports the airflow requirements of serious performance engine builds.

Why Upgrade to Individual Throttle Bodies?

Unlike a conventional plenum intake system, Individual Throttle Bodies provide each cylinder with its own dedicated throttle opening.

Benefits include:

• Instant throttle response
• Reduced intake restriction
• Improved airflow distribution
• Enhanced engine breathing
• Sharper acceleration
• Increased power potential
• Greater tuning flexibility
• Motorsport-inspired driving experience

The result is an engine that feels more responsive, more aggressive and more connected to driver inputs throughout the rev range.

Gun Metal Throttle Bodies

The Gun Metal finish provides a sophisticated motorsport appearance while showcasing the engineering quality of the induction system.

Benefits include:

• Premium finish
• Durable construction
• Distinctive engine bay appearance
• Complements air-cooled
• Porsche aesthetics
• Motorsport-inspired styling

50mm Silver Velocity Stacks

The oversized 50mm Velocity Stacks are specifically selected to complement the airflow requirements of the modified 4.0ltr engine.

Benefits include:

• Increased airflow capacity
• Reduced intake restriction
• Enhanced cylinder filling
• Improved throttle response
• Optimised high-performance breathing
• Classic Porsche race-engine appearance

These larger stacks are ideally suited to engines built for maximum naturally aspirated performance.

Classic Mesh & Foam Air Filters

This package includes the Rennen ITG Classic Mesh & Foam Air Filter Set, designed specifically to fit directly onto the 50mm Velocity Stacks.

Benefits include:

• Classic motorsport appearance
• Direct fitment to Rennen Velocity Stacks
• Excellent airflow characteristics
• Effective filtration against dust and debris
• Lightweight construction
• Washable and reusable foam elements
• Enhanced engine bay aesthetics
• Suitable for road and performance applications

The exposed mesh design perfectly complements the period-inspired appearance of the air-cooled flat-six while providing essential engine protection.

Mechanical Throttle Linkage

This kit includes the traditional mechanical throttle linkage system preferred by many Porsche enthusiasts.

Benefits include:

• Direct throttle feel
• Immediate driver feedback
• Proven reliability
• Authentic air-cooled character
• Motorsport-style operation

The mechanical linkage enhances the tactile and engaging nature of the ITB driving experience.

Why Choose the Rennen by JSR ITB System?

The Rennen by JSR system has been developed specifically for Porsche performance applications and engineered to maximise the potential of naturally aspirated air-cooled engines.

Benefits include:

• Exceptional throttle response
• Increased airflow capacity
• Improved engine breathing
• Enhanced induction acoustics
• Greater power potential
• Porsche-specific engineering
• Premium component quality
• Stunning engine bay presentation

It represents one of the most desirable induction upgrades available for a modified Porsche 964.

Rennen by JSR Individual Throttle Bodies (ITB) Upgrade for Modified Porsche 964 4.0ltr Engine

Developed for serious air-cooled Porsche performance builds, the Rennen by JSR Individual Throttle Bodies (ITB) Upgrade Kit for the Porsche 964 4.0ltr engine delivers exceptional airflow, lightning-fast throttle response and a true motorsport-inspired driving experience. Specifically configured for modified 4.0ltr engines featuring 45mm inlet bores and 50mm internal diameter Velocity Stacks, this induction package has been engineered to support the increased airflow demands of high-output naturally aspirated engine builds.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

This premium specification combines Gun Metal Individual Throttle Bodies, 50mm Silver Velocity Stacks, the Rennen ITG Air Filter Assembly (Normal Specification) and a Mechanical Throttle Linkage System, creating one of the most capable and visually impressive induction systems available for the Porsche 964 platform.

Whether fitted to a fast-road build, high-end restomod, track-focused machine or bespoke engine project, this system transforms the character of the Porsche flat-six while maximising its performance potential.

Designed for Modified 4.0ltr Engines

This ITB system has been developed specifically for enlarged-capacity Porsche 964 engines built to 4.0ltr and featuring 45mm inlet bores.

The larger bore specification provides:

• Increased airflow capacity
• Improved cylinder filling
• Enhanced high-RPM breathing
• Greater power potential
• Improved volumetric efficiency
• Enhanced throttle response
• Optimised compatibility with performance cylinder heads and camshafts

Combined with the 50mm velocity stack configuration, the system supports the airflow requirements of serious performance engine builds.

Why Upgrade to Individual Throttle Bodies?

Unlike a conventional plenum intake system, Individual Throttle Bodies provide each cylinder with its own dedicated throttle opening.

Benefits include:

• Instant throttle response
• Reduced intake restriction
• Improved airflow distribution
• Enhanced engine breathing
• Sharper acceleration
• Increased power potential
• Greater tuning flexibility
• Motorsport-inspired driving experience

The result is an engine that feels more responsive, more aggressive and more connected to driver inputs throughout the rev range.

Gun Metal Throttle Bodies

The Gun Metal finish provides a sophisticated motorsport appearance while showcasing the engineering quality of the induction system.

Benefits include:

• Premium finish
• Durable construction
• Distinctive engine bay appearance
• Complements air-cooled
• Porsche aesthetics
• Motorsport-inspired styling

50mm Silver Velocity Stacks

The oversized 50mm Velocity Stacks are specifically selected to complement the airflow requirements of the modified 4.0ltr engine.

Benefits include:

• Increased airflow capacity
• Reduced intake restriction
• Enhanced cylinder filling
• Improved throttle response
• Optimised high-performance breathing
• Classic Porsche race-engine appearance

These larger stacks are ideally suited to engines built for maximum naturally aspirated performance.

ITG Air Filter Assembly (Normal Specification)

The included ITG Air Filter Assembly provides effective filtration without compromising airflow.

Benefits include:

• Protects engine internals
• Maintains high airflow efficiency
• Washable and reusable filter media
• Supports engine longevity
• Suitable for road and fast-road applications

The normal specification assembly provides an ideal balance between filtration, airflow and practicality.

Mechanical Throttle Linkage

This kit includes the traditional mechanical throttle linkage system preferred by many Porsche enthusiasts.

Benefits include:

• Direct throttle feel
• Immediate driver feedback
• Proven reliability
• Authentic air-cooled character
• Motorsport-style operation

The mechanical linkage enhances the tactile and engaging nature of the ITB driving experience.

Why Choose the Rennen by JSR ITB System?

The Rennen by JSR system has been developed specifically for Porsche performance applications and engineered to maximise the potential of naturally aspirated air-cooled engines.

Benefits include:

• Exceptional throttle response
• Increased airflow capacity
• Improved engine breathing
• Enhanced induction acoustics
• Greater power potential
• Porsche-specific engineering
• Premium component quality
• Stunning engine bay presentation

It represents one of the most desirable induction upgrades available for a modified Porsche 964.

Individual Roller Barrel Throttle Bodies (ITB) Upgrade for Modified 3.0ltr Engine with ITG Normal Air Filter Set

Unlock the full performance potential of your modified air-cooled flat-six with the Rennen by JSR Individual Roller Barrel Throttle Body (ITB) Upgrade, engineered specifically for a modified Porsche 911 3.0ltr engine featuring 41mm inlet ports. Combining advanced roller barrel induction technology with stunning motorsport-inspired aesthetics, this complete system is designed for enthusiasts seeking the ultimate throttle response, induction sound and driver engagement.

Fits:

• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC

Finished in premium gunmetal, this package includes beautifully machined silver velocity stacks, ITG foam air filters and a precision-engineered mechanical throttle linkage system. The result is a visually striking induction setup that delivers both exceptional performance and a period-correct motorsport appearance.

Whether installed on a modified road-going Porsche, fast-road build, restomod or dedicated competition engine, the Rennen by JSR Roller Barrel ITB system transforms the way the engine responds and feels throughout the rev range.

What Makes Roller Barrel Throttle Bodies Different?

Unlike conventional butterfly throttle bodies, Roller Barrel Throttle Bodies utilise a rotating cylindrical barrel to control airflow. This design creates a smoother and less restrictive airflow path when compared to traditional throttle plates.

Advantages of Roller Barrel technology include:

• Reduced airflow restriction
• Improved airflow efficiency
• Faster throttle response
• Enhanced cylinder filling
• Reduced turbulence
• Increased performance potential
• Motorsport-derived induction technology

This design has been used in high-level racing applications for decades and is widely regarded as one of the most effective naturally aspirated induction systems available.

Why Upgrade to Individual Roller Barrel Throttle Bodies?

Individual throttle bodies provide each cylinder with its own dedicated airflow path, allowing the engine to breathe more efficiently and respond immediately to throttle inputs.

Benefits include:

• Instant throttle response
• Sharper engine acceleration
• Improved airflow distribution
• Increased induction efficiency
• Enhanced engine character
• Greater tuning flexibility
• Improved performance potential
• Exceptional induction sound

For modified Porsche 911 3.0 engines with 41mm intake ports, the combination of optimised port sizing and individual roller barrel throttle bodies helps maximise the effectiveness of other engine modifications.

Motorsport Appearance with Premium Components

The Rennen by JSR package has been designed to look every bit as impressive as it performs.

Included within the system are:

• Gunmetal-finished roller barrel throttle bodies
• Precision-machined silver velocity stacks with ID of 45mm and height of 120mm
• ITG filters - Rennen normal version       
• Mechanical throttle linkage assembly

The result is a visually stunning engine bay inspired by the legendary Porsche racing engines of the 1960s, 1970s and 1980s.

Mechanical Throttle Linkage for Pure Analogue Feel

A precision mechanical throttle linkage provides a direct connection between the accelerator pedal and the throttle bodies.

Benefits include:

• Immediate throttle actuation
• Exceptional pedal feel
• Accurate throttle modulation
• Direct driver feedback
• Enhanced engine response
• Traditional analogue driving experience

For enthusiasts who value mechanical connection and involvement, the linkage system delivers the authentic feel that makes air-cooled Porsche driving so rewarding.

Individual Throttle Bodies (ITB) Upgrade with ITG Normal Air Filter Set

Transform the character, responsiveness and visual appeal of your air-cooled Porsche with the Rennen by JSR Individual Roller Barrel Throttle Bodies (ITB) Upgrade for the Porsche 964 3.6ltr engine. Finished in a striking gunmetal coating and supplied with silver velocity stacks, ITG foam air filters, fuel rails machined for EV6 injectors and a precision-engineered mechanical throttle linkage system, this package delivers a perfect blend of motorsport-inspired performance and timeless Porsche styling.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

Unlike conventional butterfly throttle body systems, Roller Barrel Throttle Bodies utilise a rotating barrel mechanism that provides an unobstructed airflow path at wide-open throttle. This design has its roots in top-level motorsport and is widely regarded as one of the most responsive and visually impressive induction systems available for naturally aspirated engines.

For Porsche enthusiasts seeking the ultimate driving experience, the Rennen by JSR Roller Barrel ITB system offers a combination of performance, sound and aesthetics that transforms the character of the Porsche 964 3.6ltr

What Makes Roller Barrel Throttle Bodies Special?

Traditional throttle bodies use butterfly plates that partially obstruct airflow even when fully open. Roller Barrel Throttle Bodies utilise a cylindrical rotating barrel that creates a straighter and less restrictive airflow path.

The result is:

• Exceptional throttle response
• Improved airflow efficiency
• Reduced airflow turbulence
• Enhanced engine breathing
• Increased performance potential
• Smoother airflow characteristics
• Motorsport-inspired induction technology

Roller barrel systems are renowned for delivering an incredibly direct connection between throttle input and engine response.

Why Upgrade to Individual Roller Barrel Throttle Bodies?

The Porsche 964's air-cooled flat-six engine responds exceptionally well to individual throttle body induction systems.

With each cylinder receiving its own dedicated airflow source, engine responsiveness is transformed.

Benefits include:

• Instant throttle response
• Sharper acceleration feel
• Improved airflow distribution
• Increased induction efficiency
• Enhanced engine character
• Greater tuning flexibility
• Improved driver engagement
• Distinctive motorsport induction sound

The combination of Roller Barrel technology and individual throttle bodies creates one of the most desirable induction upgrades available for the Porsche 964 platform.

Motorsport Styling with Premium Engineering

The Rennen by JSR Roller Barrel ITB package is designed to look as impressive as it performs.

Featuring:

• Premium gunmetal-finished throttle bodies
• Silver velocity stacks
• ITG filters - Rennen normal version
• Precision mechanical throttle linkage

The result is a visually stunning engine bay that captures the appearance of classic Porsche race engines while incorporating modern engineering and manufacturing standards.

Mechanical Throttle Linkage for Maximum Driver Engagement

Included with the system is a precision-engineered mechanical throttle linkage assembly.

Unlike electronic (drive by wire) throttle systems, the mechanical linkage provides:

• Direct throttle actuation
• Exceptional pedal feel
• Immediate engine response
• Accurate throttle modulation
• Pure analogue driving feedback
• Motorsport-inspired control

This direct mechanical connection is a key element of the driving experience and one of the reasons enthusiasts favour traditional ITB systems.

Rennen ITG Plenum Flange Set for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen ITG Plenum Flange Set is a precision-engineered conversion solution designed specifically for Rennen by JSR Individual Barrel Throttle Body (ITB) systems. These bespoke flanges attach directly to the top of the Rennen Barrel Throttle Bodies and provide a secure mounting platform for an intake plenum chamber, replacing the traditional velocity stack arrangement.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

Plenum Inlet Diameter Options:

48mm – suitable for Porsche 3.2ltr, 3.5ltr and 3.6ltr engines
50mm – suitable for Porsche 4.0ltr engines.

Please note:
Plenum adaptor flanges are not available for 2.7 or 3.0ltr engine applications.

Supplied complete with the required mounting and securing hardware, the flange set allows engine builders and tuners to configure their induction system for plenum operation while retaining all the airflow benefits of the Rennen Barrel ITB architecture. Please note that the plenum chamber itself is not included.

This system is ideal for builders seeking alternative intake packaging solutions, improved intake air management, advanced engine management strategies or custom naturally aspirated and forced induction applications.

What Does the ITG Plenum Flange Set Do?

The flange set creates a mounting interface between the Barrel Throttle Bodies and a plenum chamber.

Its primary functions include:

• Providing secure plenum mounting
• Replacing traditional velocity stacks
• Creating a sealed induction system
• Supporting custom intake configurations
• Improving intake packaging options
• Allowing integration with plenum-based induction systems
• Supporting advanced engine management strategies

The flanges form the critical connection point between the throttle bodies and the plenum assembly.

Why Use a Plenum Instead of Velocity Stacks?

Velocity stacks are ideal for maximising throttle response and creating the classic ITB appearance. However, some applications benefit from using a plenum chamber.

Advantages of plenum systems include:

• Controlled intake air supply
• Improved intake packaging flexibility
• Easier integration with air filter systems
• Reduced intake noise
• Consistent air distribution
• Improved airflow management
• Greater flexibility for custom engine builds

The choice between velocity stacks and a plenum depends on the engine's intended use and performance objectives.

Why Is the Plenum Flange Set Important?

Without the correct mounting solution, a plenum cannot be securely attached to the throttle body assembly.

The Rennen ITG Plenum Flange Set provides:

• Correct fitment to Rennen Barrel ITBs
• Reliable sealing surfaces
• Secure plenum attachment points
• Professional installation quality
• Simplified custom intake fabrication
• Compatibility with bespoke induction systems
• Long-term durability

The flange set is the foundation of any successful plenum-based ITB installation.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are designed to maximise airflow and engine responsiveness while offering exceptional tuning flexibility.

Benefits include:

• Instant throttle response
• Increased airflow efficiency
• Enhanced engine breathing
• Greater power potential
• Improved torque characteristics
• Exceptional tuning capability
• Motorsport-inspired engineering
• Stunning engine bay presentation

The Plenum Flange Set expands these possibilities by allowing the induction system to be tailored to the specific requirements of the engine build.

Why Choose the Rennen ITG Plenum Flange Set?

Developed specifically for Rennen by JSR ITB systems, these flanges offer a professional and reliable solution for plenum-based induction conversions.

Benefits include:

• Precision-engineered fitment
• Direct compatibility with Rennen Barrel ITBs
• Complete mounting hardware included
• Supports custom plenum installations
• Professional installation solution
• Durable construction
• Suitable for road and motorsport applications       

Rennen ITG Classic Mesh Air Filter Set for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen ITG Classic Mesh Air Filter Set is a bespoke six-piece filtration package designed specifically for Rennen by JSR Individual Barrel Throttle Body systems. Each filter is engineered to fit directly onto the Rennen velocity stacks, combining classic motorsport styling with practical engine protection.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

These filters use a mesh and foam construction to help protect the engine from dust, debris and airborne contaminants while allowing the ITB system to retain its free-flowing induction characteristics. The result is a period-inspired appearance with the essential filtration needed for road, fast-road and performance use.

Designed to complement the visual appeal of exposed velocity stacks, this filter set is ideal for Porsche owners who want the classic race-engine look while still helping protect valuable internal engine components.

What Do Classic Mesh Air Filters Do?

The air filters sit directly over the velocity stacks and filter incoming air before it enters the throttle bodies and combustion chambers.

They help provide:

• Protection from dust and debris
• Reduced risk of engine contamination
• Improved engine longevity
• Cleaner intake airflow
• Protection for cylinders, rings and valves
• Classic motorsport-inspired appearance
• Practical filtration for ITB conversions

Without suitable filtration, exposed velocity stacks can allow harmful particles to enter the engine.

Why Are Air Filters Needed with Barrel Throttle Bodies?

Rennen by JSR Barrel Throttle Bodies are designed for maximum airflow and instant throttle response. However, the open intake design means air is drawn directly into each throttle body.

Adding the correct filter set helps:

• Protect expensive engine internals
• Reduce premature engine wear
• Maintain reliable performance
• Support consistent tuning
• Preserve the benefits of velocity stacks
• Improve long-term durability
• Make the conversion more practical for road use

For any road-driven ITB-equipped Porsche, air filtration should be considered an essential part of the upgrade.

Why Choose the Rennen ITG Classic Mesh Filter Set?

This filter set is developed to fit Rennen velocity stacks correctly, offering a clean installation and authentic performance appearance.

Benefits include:

• Bespoke fit for Rennen velocity stacks
• Set of 6 individual filters
• Mesh and foam construction
• Classic exposed-stack styling
• Practical filtration protection
• Lightweight and compact design
• Ideal for Porsche ITB conversions
• Suitable for performance road and motorsport-style builds

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Individual Barrel Throttle Bodies are one of the most desirable upgrades for naturally aspirated Porsche engines.

Benefits include:

• Instant throttle response
• Improved airflow efficiency
• Enhanced engine breathing
• Stronger performance potential
• Distinctive induction sound
• Greater tuning flexibility
• Motorsport-inspired engine bay appearance
• More engaging driving experience

The Classic Mesh Air Filter Set allows owners to enjoy the look and sound of velocity stacks while adding important engine protection.

Rennen ITG Air Filter Assembly - Rally for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen ITG Air Filter Assembly - Rally is the ultimate filtration solution for Rennen by JSR Individual Barrel Throttle Body (ITB) conversions. Designed for demanding road, rally, touring and motorsport applications, this upgraded filtration package combines premium ITG foam filters with enhanced sealing technology and dedicated mounting hardware to provide superior engine protection in dusty and challenging operating environments.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

Like the standard ITG Air Filter Assembly, the Rally version includes high-performance ITG foam filters and all the required hardware for secure installation onto the velocity stacks. However, the Rally specification takes protection one step further with a more robust construction and improved sealing against airborne dust and contaminants.

For owners operating their Porsche in rally, endurance, touring or harsh road conditions, the Rally Air Filter Assembly provides additional peace of mind without compromising the airflow and throttle response benefits of the Rennen by JSR Barrel ITB system.

What Does the Rally ITG Air Filter Assembly Do?

The Rally Air Filter Assembly filters incoming air before it enters the throttle bodies and combustion chambers.

Its primary functions include:

• Preventing dust ingestion
• Protecting cylinders and piston rings
• Protecting valves and valve seats
• Reducing intake contamination
• Supporting engine longevity
• Maintaining airflow efficiency
• Preserving engine performance

The enhanced sealing design provides an additional layer of protection in environments where airborne dust and debris are more prevalent.

Why Are Air Filters Essential on ITB Systems?

Individual Throttle Bodies significantly increase airflow potential and engine responsiveness. However, without effective filtration, harmful particles can enter the engine and cause accelerated wear.

Proper air filtration helps:

• Protect expensive engine components
• Reduce internal engine wear
• Maintain tuning consistency
• Protect piston rings and cylinder bores
• Improve long-term reliability
• Preserve engine performance
• Reduce maintenance costs

For road and motorsport applications alike, high-quality air filtration should always be considered an essential part of any ITB installation.

Why Choose the Rally Version?

The Rally Air Filter Assembly has been developed for environments where maximum engine protection is required.

Compared to the standard filter assembly, the Rally version offers:

• Improved sealing against dust ingress
• More robust filter mounting arrangement
• Enhanced durability
• Greater protection in harsh environments
• Improved filtration security during prolonged use
• Ideal for rally, touring and endurance applications
• Additional confidence for high-value performance engines

This makes it the preferred option for owners seeking maximum engine protection without sacrificing performance.

Why Choose ITG Foam Filters?

ITG filters are widely respected throughout motorsport and performance automotive applications for their ability to combine high airflow with exceptional filtration efficiency.

Benefits include:

• High airflow capacity
• Excellent filtration performance
• Washable and reusable design
• Lightweight construction
• Motorsport-proven technology
• Long service life
• Consistent airflow characteristics
• Suitable for high-performance engines

The foam construction provides outstanding protection while supporting the airflow demands of Individual Throttle Body systems.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies provide one of the most exciting induction upgrades available for Porsche engines.

Benefits include:

• Instant throttle response
• Improved airflow efficiency
• Increased engine breathing capacity
• Greater power potential
• Enhanced torque delivery
• Exceptional induction sound
• Motorsport-inspired driving experience
• Stunning engine bay presentation

The Rally Air Filter Assembly ensures these benefits can be enjoyed while providing enhanced protection for valuable performance engines.

Why Choose the Rennen ITG Rally Air Filter Assembly?

Developed specifically for Rennen by JSR Barrel ITB systems, this filtration package offers the ideal balance between airflow, protection and durability.

Benefits include:

• Enhanced dust sealing
• Premium ITG filtration technology
• Complete installation solution
• Includes mounting and securing hardware
• Maintains unrestricted airflow
• Protects engine internals
• Suitable for road, rally and motorsport use
• Professional installation finish       

Rennen ITG Air Filter Assembly - Normal for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen ITG Air Filter Assembly - Normal is a complete induction filtration package designed specifically for use with Rennen by JSR Individual Barrel Throttle Body (ITB) systems. The kit includes premium ITG foam air filters together with the required mounting and securing hardware for installation directly onto the Rennen velocity stacks.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

While Individual Throttle Bodies dramatically improve airflow, throttle response and engine performance, they also require effective filtration to protect the engine from dust, dirt and airborne contaminants. The Rennen ITG Air Filter Assembly provides this protection while maintaining the unrestricted airflow characteristics that make Barrel ITB conversions so desirable.

Designed to integrate seamlessly with the Rennen by JSR induction system, this filter assembly offers an excellent balance between airflow, filtration efficiency and engine protection, making it ideal for fast road, touring and occasional track use.

What Does the ITG Air Filter Assembly Do?

The ITG Air Filter Assembly protects the engine by filtering incoming air before it enters the throttle bodies and combustion chambers.

Its primary functions include:

• Preventing dirt ingestion
• Protecting cylinders and piston rings
• Protecting valves and valve seats
• Maintaining clean airflow
• Supporting engine longevity
• Preserving performance
• Reducing engine wear

The filters allow the engine to breathe freely while preventing harmful contaminants from entering the intake system.

Why Are Air Filters Essential on ITB Systems?

Individual Throttle Bodies are designed to maximise airflow and engine response. Without air filters, debris and contaminants can be drawn directly into the engine.

Proper filtration helps:

• Protect expensive engine components
• Prevent premature cylinder wear
• Maintain engine reliability
• Reduce intake contamination
• Support consistent tuning
• Preserve airflow characteristics
• Improve long-term performance

For road-driven vehicles, filtration should always be considered an essential part of any ITB installation.

Why Choose ITG Foam Filters?

ITG filters are widely recognised throughout motorsport and performance automotive applications for their excellent combination of airflow and filtration efficiency.

Benefits include:

• High airflow capacity
• Excellent filtration performance
• Lightweight construction
• Washable and reusable design
• Motorsport-proven technology
• Long service life
• Consistent airflow characteristics
• Ideal for high-performance engines

The foam filter construction allows superior airflow while maintaining effective protection against airborne contaminants.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies provide one of the most exciting induction upgrades available for Porsche engines.

Benefits include:

• Instant throttle response
• Improved airflow efficiency
• Enhanced engine breathing
• Increased power potential
• Exceptional induction sound
• Improved driver engagement
• Greater tuning flexibility
• Stunning engine bay appearance

The addition of the ITG Air Filter Assembly ensures these performance gains can be enjoyed while maintaining essential engine protection.

Why Choose the Rennen ITG Air Filter Assembly?

This kit has been developed specifically to work with Rennen by JSR Barrel ITB systems and velocity stacks.

Benefits include:

• Complete filtration solution
• Includes ITG foam filters
• Includes mounting and securing hardware
• Direct fitment to velocity stacks
• Maintains unrestricted airflow
• Protects engine internals
• Suitable for road and track applications
• Professional installation finish       

Rennen Crankshaft Position Sensor Wheel for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen Crankshaft Position Sensor Wheel is a precision-engineered trigger wheel designed specifically for use with Rennen by JSR Individual Barrel Throttle Body (ITB) conversions. Supplied as the toothed outer ring only, this component is designed to be TIG welded directly onto the engine's crankshaft pulley, creating the precise trigger pattern required by modern standalone engine management systems.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

When upgrading a Porsche engine to Rennen by JSR Barrel ITBs, accurate engine position data becomes essential. The trigger wheel works in conjunction with the crankshaft position sensor to provide the ECU with precise information regarding crankshaft position and engine speed. This data forms the foundation of all ignition and fuel injection calculations.

Without a trigger wheel and crankshaft position sensor system, modern programmable ECUs cannot accurately control ignition timing, fuel injection events or advanced engine management strategies. As a result, the trigger wheel is one of the most important supporting components required for a professional ITB conversion.

What Does a Crankshaft Position Sensor Wheel Do?

The crankshaft position sensor wheel rotates with the engine crankshaft and passes a series of precision-machined teeth past the crankshaft position sensor.

As the teeth pass the sensor, electrical signals are generated and transmitted to the ECU. The ECU uses this information to determine:

• Crankshaft position
• Engine speed (RPM)
• Ignition timing reference
• Fuel injection timing
• Engine synchronisation
• Rev limiting functions
• Sequential engine management strategies

This information allows the ECU to accurately control every aspect of engine operation.

Why Is a Trigger Wheel Required for ITB Conversions?

Rennen by JSR Barrel Throttle Bodies are typically installed alongside a standalone ECU to maximise performance and drivability.

The ECU requires an accurate crankshaft reference signal to:

• Fire ignition coils at the correct time
• Control fuel injection events
• Support sequential fuel injection systems
• Enable advanced ignition mapping
• Improve throttle response
• Stabilise idle quality
• Improve engine calibration accuracy

The trigger wheel effectively provides the ECU with a digital reference point for every engine revolution.

Without it, modern EFI systems cannot operate correctly.

TIG Welding Installation

This Rennen Trigger Wheel is supplied as the toothed outer ring only and is intended to be TIG welded directly onto the crankshaft pulley as part of the engine management conversion process.

Benefits of this design include:

• Precise positioning on the pulley
• Excellent durability
• Secure long-term attachment
• Motorsport-grade reliability
• Compatibility with custom engine management installations
• Professional conversion solution

Correct installation and positioning are critical to ensure accurate sensor readings and ECU synchronisation.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies deliver one of the most dramatic upgrades available for naturally aspirated Porsche engines.

Benefits include:

• Instant throttle response
• Increased airflow efficiency
• Improved engine breathing
• Greater power potential
• Enhanced torque delivery
• Exceptional induction sound
• Motorsport-inspired driving experience
• Stunning engine bay presentation

When paired with modern engine management and accurate crankshaft position monitoring, the system delivers outstanding performance and drivability.

Why Choose the Rennen Crankshaft Position Sensor Wheel?

Developed specifically for Rennen by JSR ITB applications, this trigger wheel provides the precision required for professional ECU calibration and reliable engine operation.

Benefits include:

• Accurate crankshaft position reference
• Supports standalone ECU systems
• Essential for EFI conversions
• Enables precise ignition timing
• Supports advanced fuel injection strategies
• Suitable for road and motorsport applications
• Reliable long-term performance
• Professional-grade installation solution       

Rennen Camshaft Position Sensor for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen Camshaft Position Sensor (CMP Sensor) is a critical engine management component designed specifically for use with Rennen by JSR Individual Barrel Throttle Body (ITB) upgrades. Working alongside the Crankshaft Position Sensor, the camshaft sensor provides the ECU with precise information regarding camshaft position and engine cycle synchronisation, allowing modern engine management systems to control fuel injection and ignition timing with maximum accuracy.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

When upgrading a Porsche engine to Rennen by JSR Barrel ITBs and standalone engine management, accurate engine position data becomes essential. While the crankshaft sensor identifies engine speed and crank position, the camshaft position sensor tells the ECU exactly which cylinder is on its firing cycle. This information allows advanced ECU strategies such as sequential fuel injection and cylinder-specific ignition mapping.

For high-performance road, track and motorsport Porsche engines, the camshaft position sensor is a key component in unlocking the full potential of an Individual Throttle Body conversion.

What Does a Camshaft Position Sensor Do?

The camshaft position sensor continuously monitors the position of the camshaft and transmits this information to the ECU.

The ECU uses this data to determine:

• Cylinder identification
• Camshaft position
• Engine cycle synchronisation
• Sequential fuel injection timing
• Ignition event timing
• Engine start-up strategy
• Advanced engine management functions

A properly functioning camshaft sensor helps provide:

• Accurate fuel delivery
• Improved ignition control
• Faster engine starting
• Enhanced throttle response
• Stable idle quality
• Improved drivability
• Greater tuning precision

The sensor enables the ECU to know exactly where the engine is within its operating cycle.

Why Is a Camshaft Position Sensor Essential for ITB Conversions?

Rennen by JSR Barrel Throttle Body systems are designed to maximise engine performance and responsiveness. To fully exploit these benefits, modern programmable engine management systems require highly accurate engine position information.

The camshaft position sensor allows:

• Sequential fuel injection operation
• Cylinder-specific ignition timing
• Improved cold-start performance
• Enhanced fuel economy
• Smoother idle characteristics
• More precise tuning control
• Improved emissions control where applicable

Without a camshaft position sensor, many ECUs are forced to operate in less sophisticated batch-fire fuel injection modes, reducing the overall refinement and efficiency of the engine.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are engineered to deliver exceptional airflow and a truly engaging driving experience.

Benefits include:

• Instant throttle response
• Increased airflow capacity
• Improved engine breathing
• Enhanced power and torque potential
• Motorsport-inspired induction sound
• Greater tuning flexibility
• Improved driver engagement
• Stunning engine bay appearance

When combined with accurate crankshaft and camshaft position monitoring, the system delivers professional-level engine management performance.

Why Choose the Rennen Camshaft Position Sensor?

Developed specifically for Rennen by JSR ITB applications, this sensor provides the accuracy and reliability required for advanced ECU calibration.

Benefits include:

• Accurate camshaft position measurement
• Supports sequential fuel injection
• Enables advanced ECU functionality
• Improves engine synchronisation
• Enhances drivability
• Supports high-performance tuning
• Suitable for road and motorsport applications
• Reliable long-term operation       

Rennen Crankshaft Position Sensor (CPS) for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen Crankshaft Position Sensor (CPS) is one of the most important components within a modern engine management system and an essential part of any Rennen by JSR Individual Barrel Throttle Body (ITB) conversion. The sensor continuously monitors crankshaft position and engine speed, providing the ECU with the precise information required to control ignition timing, fuel injection events and overall engine operation.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50

When upgrading a Porsche engine to Individual Barrel Throttle Bodies and standalone engine management, accurate engine position data becomes critical. The ECU relies on the Crankshaft Position Sensor as its primary reference point for engine synchronisation. Without a reliable crankshaft signal, the ECU cannot accurately determine engine speed or crankshaft position, making precise ignition and fuel control impossible.

Whether you're building a fast road Porsche, a high-performance air-cooled engine or a dedicated motorsport application, the CPS provides the foundation for accurate ECU calibration and maximum engine performance.

What Does a Crankshaft Position Sensor Do?

The Crankshaft Position Sensor monitors the exact rotational position and speed of the engine crankshaft.

The sensor transmits this information directly to the ECU, allowing it to determine:

• Engine speed (RPM)
• Crankshaft position
• Ignition timing events
• Fuel injection timing
• Engine synchronisation
• Rev limiting functions
• Starting and idle control strategies

A properly functioning CPS helps provide:

• Accurate ignition timing
• Precise fuel delivery
• Reliable engine starting
• Smooth idle operation
• Stable engine performance
• Improved drivability
• Consistent ECU operation

The crankshaft sensor effectively serves as the heartbeat of the engine management system.

Why Is a CPS Essential for ITB Conversions?

Rennen by JSR Barrel Throttle Body conversions are typically paired with modern programmable engine management systems to unlock their full performance potential.

For the ECU to operate correctly, it must know the precise position of the crankshaft at all times. The CPS provides this information continuously and with extreme accuracy.

This allows:

• Sequential fuel injection control
• Accurate ignition timing maps
• Stable idle quality
• Improved throttle response
• Faster ECU processing
• Enhanced tuning accuracy
• Reliable high-RPM operation

Without a crankshaft position signal, the ECU simply cannot determine when to fire injectors or ignition coils.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are engineered to maximise airflow while delivering an authentic motorsport driving experience.

Benefits include:

• Instant throttle response
• Increased airflow efficiency
• Improved engine breathing
• Enhanced power and torque potential
• Exceptional induction sound Increased driver engagement
• Modern EFI compatibility
• Stunning engine bay appearance

When combined with accurate crankshaft position monitoring, standalone engine management and professional calibration, the result is a highly responsive and exceptionally capable Porsche engine.

Why Choose the Rennen CPS?

Developed specifically for Rennen by JSR ITB applications, the sensor delivers the accuracy and reliability required for professional engine management installations.

Benefits include:

• Precise crankshaft position measurement
• Accurate engine speed monitoring
• Supports standalone ECU systems
• Essential for EFI conversions
• Improves ignition timing accuracy
• Supports sequential fuel injection
• Suitable for road and motorsport applications
• Reliable long-term performance       

Rennen Throttle Position Sensor (TPS) for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen Throttle Position Sensor (TPS) is a critical engine management component designed specifically for use with Rennen by JSR Individual Barrel Throttle Body (ITB) upgrades. Mounted directly to the throttle assembly, the TPS continuously measures throttle opening angle and relays this information to the engine control unit (ECU), allowing precise fuel and ignition calculations throughout the engine's operating range.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

When upgrading a Porsche engine to Individual Barrel Throttle Bodies, accurate throttle position data becomes even more important. The instantaneous airflow characteristics of ITBs demand rapid ECU response, and the TPS provides the critical information required to deliver smooth drivability, sharp throttle response and maximum performance.

Whether you're building a fast road Porsche, a track day machine or a dedicated motorsport engine, the TPS is an essential component in achieving a professional and properly calibrated ITB installation.

What Does a Throttle Position Sensor Do?

The Throttle Position Sensor measures the exact position of the throttle barrels and communicates this information directly to the ECU.

The ECU uses this data to determine:

• Throttle opening percentage
• Driver demand
• Acceleration enrichment requirements
• Ignition timing adjustments
• Fuel delivery calculations
• Deceleration fuel cut strategies
• Idle and part-throttle control

A properly functioning TPS helps provide:

• Instant throttle response
• Accurate fuel mapping
• Smooth acceleration
• Stable idle quality
• Improved drivability
• Enhanced engine performance
• Reliable ECU operation

Without accurate throttle position data, modern engine management systems cannot react correctly to driver inputs.

Why Is a TPS Essential for ITB Conversions?

Individual Barrel Throttle Bodies dramatically improve airflow and engine response, but they also require more precise engine management control.

Unlike traditional airflow-restricted intake systems, ITBs allow airflow to increase almost instantly as the throttle opens. The ECU therefore relies heavily on TPS input to determine fuel and ignition requirements during rapid throttle movements.

The TPS allows:

• Accurate throttle-based load calculations
• Faster ECU response times
• Improved transient fueling
• Smoother acceleration
• Better throttle modulation
• Enhanced drivability
• More accurate engine calibration

Without a TPS, an ITB-equipped engine can suffer from hesitation, poor throttle transitions and inconsistent performance.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are engineered to maximise airflow while delivering a true motorsport-inspired driving experience.

Benefits include:

• Instant throttle response
• Increased airflow efficiency
• Improved engine breathing
• Enhanced power potential
• Greater tuning flexibility
• Exceptional induction sound
• Improved driver engagement
• Stunning engine bay appearance

When combined with a correctly calibrated ECU, MAP sensor and TPS, the result is an engine that delivers exceptional responsiveness and performance.

Why Choose the Rennen TPS?

Developed specifically for Rennen by JSR ITB applications, this sensor delivers the accuracy and reliability required for professional-level ECU calibration and performance tuning.

Benefits include:

• Accurate throttle position measurement
• Compatible with Rennen by JSR Barrel ITBs
• Supports standalone ECU systems
• Improves tuning precision
• Enhances throttle response
• Supports motorsport and fast road applications
• Reliable long-term performance
• Essential for modern EFI engine management       

Rennen MAP Sensor for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen MAP Sensor is a critical engine management component designed specifically for use with Rennen by JSR Individual Barrel Throttle Body (ITB) upgrades. Working alongside the Rennen Vacuum Manifold system, the MAP (Manifold Absolute Pressure) Sensor provides the engine control unit (ECU) with accurate engine load data, allowing precise fuel and ignition calculations throughout the entire rev range.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

When converting a Porsche engine to Individual Barrel Throttle Bodies, the original intake and airflow characteristics change significantly. Unlike conventional plenum intake systems, individual throttle bodies generate multiple pulsing vacuum signals which must be stabilised and measured correctly. The Rennen MAP Sensor, combined with the Rennen Vacuum Manifold, delivers the accurate load signal required for modern ECU calibration and reliable engine operation.

Whether you are building a fast road Porsche, a track-focused machine or a competition engine, the MAP sensor is one of the most important components in ensuring your ITB conversion performs exactly as intended.

What Does a MAP Sensor Do?

MAP stands for Manifold Absolute Pressure.

The sensor continuously measures the vacuum and pressure levels within the intake system and sends this information to the ECU. The ECU then uses this data to calculate engine load and make real-time adjustments to fuel delivery and ignition timing.

A properly functioning MAP sensor helps provide:

• Accurate engine load measurement
• Precise fuel mapping
• Optimised ignition timing
• Stable idle quality
• Improved throttle response
• Enhanced drivability
• Reliable cold starting
• Consistent engine performance

Without a stable and accurate MAP signal, modern engine management systems cannot correctly determine engine operating conditions.

Why Is a MAP Sensor Essential for ITB Conversions?

Individual Throttle Body systems dramatically improve airflow and throttle response, but they also create unique tuning challenges.

Unlike a traditional intake manifold, each throttle body generates its own vacuum pulse. The Rennen Vacuum Manifold combines these signals into a smooth vacuum source which the MAP sensor can accurately measure.

This allows:

• Standalone ECUs to calculate engine load correctly
• More accurate fuel delivery
• Improved ignition control
• Stable idle operation
• Better low-speed drivability
• Enhanced throttle transitions
• Improved tuning consistency

The result is an ITB-equipped Porsche that not only sounds incredible but also drives smoothly and predictably.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are engineered to maximise airflow while delivering a motorsport-inspired driving experience.

Benefits include:

• Instant throttle response
• Improved engine breathing
• Increased power potential
• Enhanced torque delivery
• Exceptional induction sound
• Improved driver engagement
• Modern EFI compatibility
• Stunning engine bay appearance

When paired with a properly calibrated ECU and accurate MAP sensor data, the system delivers both performance and drivability.

Why Choose the Rennen MAP Sensor?

Developed specifically for Rennen by JSR ITB applications, this sensor provides the accuracy and reliability required for professional-level engine management calibration.

Benefits include:

• Accurate vacuum and pressure measurement
• Compatible with Rennen Vacuum Manifold systems
• Supports standalone ECU installations
• Essential for ITB engine management
• Improves tuning accuracy
• Enhances drivability
• Suitable for road and motorsport applications
• Reliable long-term performance       

Rennen Vacuum Fittings & Tube Set for Use with Rennen Vacuum Manifold

Complete your Porsche Barrel Individual Throttle Body conversion with the Rennen Vacuum Fittings & Tube Set, specifically engineered for use with the Rennen by JSR Vacuum Manifold. This installation kit provides the vacuum fittings, connectors and tubing required to correctly link each throttle body to the vacuum manifold, ensuring a stable and reliable vacuum signal for engine management and ancillary systems.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93

Designed exclusively for Rennen by JSR Barrel ITB systems, this kit forms an essential part of the overall induction and engine management package. By combining the vacuum signals from each individual throttle body, the system creates a stable vacuum source that can be used for MAP sensors, fuel pressure regulators, idle control strategies and other engine management functions.

For any EFI-controlled Individual Throttle Body conversion, achieving a consistent vacuum signal is critical to drivability, tuning accuracy and overall engine performance.

What Does the Vacuum Fittings & Tube Set Do?

Individual throttle body systems generate vacuum independently from each intake runner. Because these vacuum signals fluctuate rapidly, they need to be combined through a vacuum manifold system to create a smooth and usable signal.

The Rennen Vacuum Fittings & Tube Set allows:

• Connection of each throttle body to the vacuum manifold
• Stable vacuum signal generation
• Accurate MAP sensor readings
• Improved ECU tuning capability
• Consistent engine load measurement
• Reliable idle control strategies
• Enhanced drivability

Without the correct vacuum plumbing, modern engine management systems can struggle to interpret engine load accurately.

Why Is a Vacuum Manifold Important on Barrel ITBs?

Barrel throttle bodies provide exceptional airflow and throttle response but naturally produce highly pulsed vacuum signals.

The Rennen by JSR Vacuum Manifold and associated fittings help:

• Smooth vacuum fluctuations
• Improve MAP sensor accuracy
• Enhance fuel delivery calculations
• Improve ignition mapping accuracy
• Stabilise idle operation
• Improve low-speed drivability
• Simplify ECU calibration

The result is a more refined and predictable engine that retains all the performance benefits of an Individual Throttle Body conversion.

Why Are Individual Throttle Body Upgrades So Popular?

Individual Throttle Body systems are widely regarded as one of the most desirable naturally aspirated performance upgrades available for Porsche engines.

Benefits include:

• Instant throttle response
• Improved airflow efficiency
• Enhanced engine breathing
• Increased performance potential
• Greater tuning flexibility
• Motorsport-inspired induction sound
• Improved driver engagement
• Stunning engine bay appearance

When combined with modern EFI systems and correctly configured vacuum management, ITBs deliver exceptional performance and drivability.

Why Choose the Rennen Vacuum Fittings & Tube Set?

This kit has been developed specifically to work with the Rennen by JSR Vacuum Manifold and Barrel ITB systems.

Benefits include:

• Correct fitment for Rennen systems
• Simplified installation
• Reliable vacuum connections
• Improved tuning accuracy
• Stable engine management signals
• Professional conversion finish
• Suitable for road and motorsport use
• Supports advanced ECU functionality       

Individual Roller Barrel Throttle Bodies (ITB) Upgrade for Modified 3.0ltr Engine

Unlock the full performance potential of your modified air-cooled flat-six with the Rennen by JSR Individual Roller Barrel Throttle Body (ITB) Upgrade, engineered specifically for a modified Porsche 911 3.0ltr engine featuring 41mm inlet ports. Combining advanced roller barrel induction technology with stunning motorsport-inspired aesthetics, this complete system is designed for enthusiasts seeking the ultimate throttle response, induction sound and driver engagement.

Fits:

• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC

Finished in premium gunmetal, this package includes beautifully machined silver velocity stacks, classic mesh air filters and a precision-engineered mechanical throttle linkage system. The result is a visually striking induction setup that delivers both exceptional performance and a period-correct motorsport appearance.

Whether installed on a modified road-going Porsche, fast-road build, restomod or dedicated competition engine, the Rennen by JSR Roller Barrel ITB system transforms the way the engine responds and feels throughout the rev range.

What Makes Roller Barrel Throttle Bodies Different?

Unlike conventional butterfly throttle bodies, Roller Barrel Throttle Bodies utilise a rotating cylindrical barrel to control airflow. This design creates a smoother and less restrictive airflow path when compared to traditional throttle plates.

Advantages of Roller Barrel technology include:

• Reduced airflow restriction
• Improved airflow efficiency
• Faster throttle response
• Enhanced cylinder filling
• Reduced turbulence
• Increased performance potential
• Motorsport-derived induction technology

This design has been used in high-level racing applications for decades and is widely regarded as one of the most effective naturally aspirated induction systems available.

Why Upgrade to Individual Roller Barrel Throttle Bodies?

Individual throttle bodies provide each cylinder with its own dedicated airflow path, allowing the engine to breathe more efficiently and respond immediately to throttle inputs.

Benefits include:

• Instant throttle response
• Sharper engine acceleration
• Improved airflow distribution
• Increased induction efficiency
• Enhanced engine character
• Greater tuning flexibility
• Improved performance potential
• Exceptional induction sound

For modified Porsche 911 3.0 engines with 41mm intake ports, the combination of optimised port sizing and individual roller barrel throttle bodies helps maximise the effectiveness of other engine modifications.

Motorsport Appearance with Premium Components

The Rennen by JSR package has been designed to look every bit as impressive as it performs.

Included within the system are:

• Gunmetal-finished roller barrel throttle bodies
• Precision-machined silver velocity stacks with ID of 45mm and height of 120mm
• Classic motorsport-style mesh air filters
• Mechanical throttle linkage assembly

The result is a visually stunning engine bay inspired by the legendary Porsche racing engines of the 1960s, 1970s and 1980s.

Mechanical Throttle Linkage for Pure Analogue Feel

A precision mechanical throttle linkage provides a direct connection between the accelerator pedal and the throttle bodies.

Benefits include:

• Immediate throttle actuation
• Exceptional pedal feel
• Accurate throttle modulation
• Direct driver feedback
• Enhanced engine response
• Traditional analogue driving experience

For enthusiasts who value mechanical connection and involvement, the linkage system delivers the authentic feel that makes air-cooled Porsche driving so rewarding.