Electronic Fuel Injection Throttle Kits

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       

Cam Position Sensor Mounting Bracket for ITB Conversions

The Rennen Cam Position Sensor Mounting Bracket is a precision-engineered component designed specifically for Porsche 911 and Porsche 964 Individual Throttle Body (ITB) conversions. Developed to provide a secure and accurate mounting location for a cam position sensor, this bracket enables modern engine management systems to utilise camshaft position data for improved ignition timing, fuel delivery and overall engine control.

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

As Porsche enthusiasts increasingly move towards advanced EFI and standalone ECU systems, accurate engine position monitoring becomes critical. The cam position sensor mounting bracket provides the stability and precision required to ensure reliable sensor operation in both high-performance road and motorsport applications.

Designed to integrate seamlessly with Rennen by JSR ITB systems, this bracket helps unlock the full potential of modern engine management while preserving the character of the classic air-cooled Porsche engine.

What Does a Cam Position Sensor Mounting Bracket Do?

The mounting bracket securely positions the camshaft position sensor relative to the engine's camshaft trigger reference point.

This allows the ECU to accurately determine camshaft position and synchronise critical engine functions, including:

• Sequential fuel injection
• Sequential ignition control
• Accurate engine timing calculation
• Cylinder identification
• Advanced ECU tuning strategies
• Improved engine management precision

Without a stable and accurately positioned sensor mount, the ECU may struggle to maintain consistent timing and engine synchronisation.

Why Is a Cam Position Sensor Important?

Modern engine management systems rely on precise engine position information to optimise performance.

Cam position data helps provide:

• Improved ignition accuracy
• More precise fuel delivery
• Enhanced engine response
• Improved idle stability
• Better cold-start performance
• Greater tuning flexibility
• Optimised engine efficiency
• Support for advanced ECU functionality

For high-performance Porsche engine builds, accurate camshaft position monitoring is often essential for extracting maximum performance and drivability.

Why Is an ITB Upgrade So Appealing?

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

Unlike conventional intake systems, ITBs provide each cylinder with its own dedicated throttle body, dramatically improving airflow characteristics and throttle response.

Benefits of a Rennen by JSR ITB conversion include:

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

When combined with modern EFI and engine management systems, ITBs deliver a unique driving experience that blends classic Porsche character with modern performance technology.

Why Choose the Rennen by JSR Cam Sensor Bracket?

A precision-engineered sensor mounting solution is critical for accurate ECU operation.

Benefits include:

• Secure sensor mounting
• Accurate sensor positioning
• Improved ECU signal reliability
• Enhanced engine management performance
• Greater tuning accuracy
• Improved engine synchronisation
• Reliable operation in road and motorsport environments
• Professional-quality installation       

Crankshaft Position Sensor Mounting Bracket for ITB Conversions

The Rennen Crankshaft Position Sensor Mounting Bracket is a precision-engineered component developed specifically for Porsche 911 and Porsche 964 Individual Throttle Body (ITB) conversions. Designed to provide accurate and stable mounting of the crankshaft position sensor, this bracket enables modern engine management systems to monitor crankshaft position and engine speed with exceptional precision.

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

As Porsche performance builds increasingly adopt standalone ECUs and modern EFI systems, accurate crankshaft position data has become essential for reliable ignition timing, fuel delivery and engine synchronisation. The Rennen by JSR mounting bracket ensures the crankshaft sensor remains securely positioned in relation to the trigger wheel, providing a clean and consistent signal under all operating conditions.

Whether building a fast-road Porsche, a high-performance air-cooled engine or a dedicated motorsport application, this bracket forms a critical part of a professional EFI and ITB conversion.

What Does a Crankshaft Position Sensor Mounting Bracket Do?

The crankshaft position sensor mounting bracket securely locates the crankshaft sensor in the correct position relative to the trigger wheel mounted on the engine.

This allows the ECU to accurately monitor:

• Crankshaft position Engine speed (RPM)
• Ignition timing reference
• Fuel injection timing
• Engine synchronisation
• Advanced ECU control functions

A stable and accurately positioned sensor is critical for reliable engine operation and precise ECU calibration.

Why Is a Crankshaft Position Sensor Important?

The crankshaft position sensor is one of the most important inputs used by a modern engine management system.

Without an accurate crankshaft signal, the ECU cannot reliably control ignition or fuel delivery.

Benefits of accurate crankshaft position monitoring include:

• Precise ignition timing
• Accurate fuel injection control
• Stable engine operation
• Improved starting performance
• Enhanced throttle response
• Greater tuning flexibility
• Improved engine efficiency
• Reliable high-RPM performance

For performance-oriented Porsche engine builds, accurate crankshaft data forms the foundation of effective ECU control and engine tuning.

Why Is an ITB Upgrade So Appealing?

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

By providing each cylinder with its own dedicated throttle body, airflow restrictions are reduced and throttle response is dramatically improved.

Benefits of a Rennen by JSR ITB conversion include:

• Immediate throttle response
• Improved airflow efficiency
• Enhanced engine breathing
• Increased performance potential
• Greater tuning flexibility
• Distinctive induction sound
• Motorsport-inspired engine character
• Increased driver engagement

When paired with modern EFI and engine management systems, ITBs offer a unique blend of classic Porsche character and modern performance technology.

Why Choose the Rennen by JSR Crank Sensor Bracket?

A precision-engineered crankshaft sensor mounting solution is essential for reliable ECU operation.

Benefits include:

• Accurate sensor positioning
• Stable trigger wheel alignment
• Consistent ECU signal quality
• Improved ignition timing accuracy
• Enhanced engine management reliability
• Professional EFI conversion installation
• Suitable for road and motorsport applications
• Supports advanced engine tuning strategies       

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 ITBs for Air-Cooled Porsche 911 - Advanced Roller Barrel Individual Throttle Bodies 

The Rennen ITBs by JSR represent the next generation of individual throttle body technology for air-cooled Porsche 911 engines. Designed and engineered specifically to extract optimal performance from classic Porsche flat-six engines, these innovative roller barrel throttle bodies deliver exceptional airflow, sharper throttle response, and improved engine efficiency compared to conventional butterfly valve throttle body 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

Developed through extensive research, flow simulation analysis and real-world testing, the Rennen ITB system provides a premium induction solution for performance-focused Porsche enthusiasts, restorers, track-day drivers and motorsport applications.

Whether you are building a high-performance Porsche 911 engine or converting a classic air-cooled Porsche to modern EFI, Rennen ITBs by JSR offer a significant advancement in intake technology.

Why Choose Rennen Roller Barrel ITBs?

Unlike traditional individual throttle bodies that utilise a butterfly valve positioned directly in the airflow path, the Rennen ITB system features a precision-engineered tapered roller barrel design.

This innovative approach provides several key advantages:

Unrestricted Airflow

The roller barrel design eliminates the butterfly valve obstruction found in conventional throttle bodies. With no throttle plate disrupting airflow, air moves more efficiently into the engine, improving volumetric efficiency and overall performance.

Increased Air Velocity

Because there is no butterfly valve occupying space within the throttle bore, the throttle body diameter can be optimised to maintain higher air velocity. Higher intake air speed promotes superior cylinder filling and enhanced engine response throughout the rev range.

Superior Fuel Atomisation

At partial throttle openings, airflow passes directly over the fuel injector. This promotes exceptional atomisation of the air-fuel mixture, improving combustion efficiency, drivability and throttle progression.

Instant Throttle Response

The short distance between the roller barrel and the inlet valve creates a highly responsive induction system, delivering immediate engine response and a direct connection between driver input and engine output.

 The ITB kit comes with the ITBs mounted on intake manifolds and with fuel rails made for the EV6 injector type. 

Advanced Flow Simulation & Development

Extensive computational fluid dynamics (CFD) analysis and development testing have been carried out to optimise every aspect of the Rennen ITB design.

Flow simulation data demonstrates:

• Direct airflow over the fuel injector during part-throttle operation.
• Significantly reduced turbulence around the injector area compared to traditional butterfly throttle bodies.
• Up to 20% less airflow restriction at full throttle when compared with conventional ITB systems.
• Improved airflow consistency across all cylinders for enhanced engine balance and performance.

The result is a highly efficient induction system capable of supporting both fast road and high-performance motorsport applications.

Premium Motorsport-Grade Construction

Every Rennen ITB by JSR system is manufactured to the highest standards using precision CNC machining and premium materials.

Precision CNC Machined

All components are machined from high-grade 6082-T6 aluminium to ensure exceptional dimensional accuracy and durability.

Perfect Airflow Distribution

Tight manufacturing tolerances ensure evenly distributed airflow across all throttle bodies, promoting balanced cylinder performance and simplified engine tuning.

Easy Synchronisation

The robust design incorporates minimal joints and connections, allowing straightforward throttle synchronisation and reducing the need for ongoing adjustment.

Long-Term Reliability

Throttle barrels are mounted within sealed ball bearings for smooth operation, durability and long service life under demanding conditions.

Premium Sealing Technology

All sealing surfaces utilise Viton O-rings to prevent false air entry and maintain optimal engine performance.

Quality Components Throughout

Only premium bearings, rod ends and stainless-steel fasteners are used throughout the assembly, ensuring reliability and durability in both road and track environments.

Hard Anodised Finish - Available in Gun Metal or Black Finish

All aluminium components receive a hard anodised gunmetal grey finish, providing corrosion resistance and an attractive motorsport inspired appearance.

Specification
Fuel Rails machined for EV6 injector type
2 bolt inlet manifold to cylinder head mounting
48mm velocity stack ID
120mm velocity stack length

The Ultimate Porsche Individual Throttle Body Upgrade

For enthusiasts seeking the ultimate air-cooled Porsche induction system, Rennen ITBs by JSR combine cutting-edge engineering, advanced airflow technology and premium construction quality. The innovative roller barrel design delivers exceptional throttle response, improved airflow efficiency, enhanced fuel atomisation and proven performance gains.

Rennen ITBs for Air-Cooled Porsche 911 - Advanced Roller Barrel Individual Throttle Bodies 

The Rennen ITBs by JSR represent the next generation of individual throttle body technology for air-cooled Porsche 911 engines. Designed and engineered specifically to extract optimal performance from classic Porsche flat-six engines, these innovative roller barrel throttle bodies deliver exceptional airflow, sharper throttle response, and improved engine efficiency compared to conventional butterfly valve throttle body systems.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC

Developed through extensive research, flow simulation analysis and real-world testing, the Rennen ITB system provides a premium induction solution for performance-focused Porsche enthusiasts, restorers, track-day drivers and motorsport applications.

Whether you are building a high-performance Porsche 911 engine or converting a classic air-cooled Porsche to modern EFI, Rennen ITBs by JSR offer a significant advancement in intake technology.

Why Choose Rennen Roller Barrel ITBs?

Unlike traditional individual throttle bodies that utilise a butterfly valve positioned directly in the airflow path, the Rennen ITB system features a precision-engineered tapered roller barrel design.

This innovative approach provides several key advantages:

Unrestricted Airflow

The roller barrel design eliminates the butterfly valve obstruction found in conventional throttle bodies. With no throttle plate disrupting airflow, air moves more efficiently into the engine, improving volumetric efficiency and overall performance.

Increased Air Velocity

Because there is no butterfly valve occupying space within the throttle bore, the throttle body diameter can be optimised to maintain higher air velocity. Higher intake air speed promotes superior cylinder filling and enhanced engine response throughout the rev range.

Superior Fuel Atomisation

At partial throttle openings, airflow passes directly over the fuel injector. This promotes exceptional atomisation of the air-fuel mixture, improving combustion efficiency, drivability and throttle progression.

Instant Throttle Response

The short distance between the roller barrel and the inlet valve creates a highly responsive induction system, delivering immediate engine response and a direct connection between driver input and engine output.

 The ITB kit comes with the ITBs mounted on intake manifolds and with fuel rails made for the EV6 injector type.

Advanced Flow Simulation & Development

Extensive computational fluid dynamics (CFD) analysis and development testing have been carried out to optimise every aspect of the Rennen ITB design.

Flow simulation data demonstrates:

• Direct airflow over the fuel injector during part-throttle operation.
• Significantly reduced turbulence around the injector area compared to traditional butterfly throttle bodies.
• Up to 20% less airflow restriction at full throttle when compared with conventional ITB systems.
• Improved airflow consistency across all cylinders for enhanced engine balance and performance.

The result is a highly efficient induction system capable of supporting both fast road and high-performance motorsport applications.

Premium Motorsport-Grade Construction

Every Rennen ITB by JSR system is manufactured to the highest standards using precision CNC machining and premium materials.

Precision CNC Machined

All components are machined from high-grade 6082-T6 aluminium to ensure exceptional dimensional accuracy and durability.

Perfect Airflow Distribution

Tight manufacturing tolerances ensure evenly distributed airflow across all throttle bodies, promoting balanced cylinder performance and simplified engine tuning.

Easy Synchronisation

The robust design incorporates minimal joints and connections, allowing straightforward throttle synchronisation and reducing the need for ongoing adjustment.

Long-Term Reliability

Throttle barrels are mounted within sealed ball bearings for smooth operation, durability and long service life under demanding conditions.

Premium Sealing Technology

All sealing surfaces utilise Viton O-rings to prevent false air entry and maintain optimal engine performance.

Quality Components Throughout

Only premium bearings, rod ends and stainless-steel fasteners are used throughout the assembly, ensuring reliability and durability in both road and track environments.

Hard Anodised Finish - Available in Gun Metal or Black Finish

All aluminium components receive a hard anodised gunmetal grey finish, providing corrosion resistance and an attractive motorsport inspired appearance.

Specification
Fuel Rails machined for EV6 injector type
2 bolt inlet manifold to cylinder head mounting
45mm velocity stack ID
120mm velocity stack length

The Ultimate Porsche Individual Throttle Body Upgrade

For enthusiasts seeking the ultimate air-cooled Porsche induction system, Rennen ITBs by JSR combine cutting-edge engineering, advanced airflow technology and premium construction quality. The innovative roller barrel design delivers exceptional throttle response, improved airflow efficiency, enhanced fuel atomisation and proven performance gains.

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 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.

Mechanical Throttle Linkage Assembly for Individual Throttle Body (ITB) Systems

The Rennen Mechanical Throttle Linkage Assembly is a precision-engineered solution designed specifically for Rennen Individual Throttle Body (ITB) conversions. Available in two configurations, one for the traditional solid accelerator rod system found in classic Porsche 911 models and another for the accelerator cable system used on Porsche 964 models, this assembly provides smooth, accurate and reliable throttle 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
• 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

As one of the most critical components in an ITB installation, the throttle linkage transfers driver input directly to the throttle bodies, ensuring precise synchronisation and immediate engine response. Designed to integrate seamlessly with Rennen by JSR ITB systems, the linkage assembly delivers the direct mechanical feel Porsche enthusiasts expect while maintaining excellent throttle control and drivability.

Whether you're building a high-performance road car, a track-focused machine or a fully restored air-cooled Porsche, a properly engineered throttle linkage is essential for unlocking the full potential of an ITB conversion.

What Does a Mechanical Throttle Linkage Do?

The throttle linkage connects the accelerator pedal mechanism to the individual throttle bodies, translating driver input into precise throttle movement.

Its primary functions include:

• Controlling throttle opening and closing
• Synchronising multiple throttle bodies
• Delivering accurate throttle response
• Providing smooth pedal feel
• Maintaining consistent throttle operation
• Supporting reliable engine performance

The assembly is available in two versions:

Porsche 911 Solid Accelerator Rod Version

Designed for classic Porsche 911 models that utilise the factory mechanical rod linkage system. This version integrates with the original accelerator rod arrangement while providing accurate control of the ITB system.

Porsche 964 Accelerator Cable Version

Designed for Porsche 964 models equipped with a throttle cable system. This version provides a clean and reliable connection between the accelerator cable and the individual throttle body assembly.

Why Is an ITB Upgrade So Appealing?

Individual Throttle Body systems are widely considered one of the most rewarding naturally aspirated performance upgrades available for Porsche engines.

Unlike conventional intake systems that use a shared plenum, ITBs provide each cylinder with its own dedicated throttle body, allowing the engine to breathe more efficiently and respond instantly to throttle inputs.

Benefits of a Rennen by JSR ITB conversion include:

• Immediate throttle response
• Improved airflow efficiency
• Enhanced engine breathing
• Increased performance potential
• Greater tuning flexibility
• Distinctive induction sound
• Improved driver engagement
• Motorsport-inspired driving characteristics

For many Porsche enthusiasts, the combination of razor-sharp throttle response and an unmistakable induction note makes ITBs one of the most desirable engine upgrades available.

Why a Quality Throttle Linkage Matters

Even the best throttle bodies cannot perform correctly without a precise and reliable linkage system.

A high-quality linkage assembly helps:

• Deliver accurate throttle control
• Maintain throttle body synchronisation
• Improve pedal feel
• Eliminate unwanted play or movement
• Support consistent engine tuning
• Improve overall drivability
• Maximise ITB performance benefits

A properly engineered linkage transforms the driving experience by creating a direct connection between the driver and the engine.

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 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 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       

Rennen Vacuum Manifold for Individual Throttle Body (ITB) Systems

The Rennen Vacuum Manifold is a key component of the Rennen Individual Throttle Body (ITB) Upgrade system, designed to provide a stable and consistent vacuum signal from multiple throttle bodies on high-performance Porsche engines. Engineered specifically for use with Rennen ITB installations, this vacuum manifold simplifies vacuum management while supporting modern engine management systems, fuel pressure regulators, brake servo systems and manifold pressure sensors.

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

Individual Throttle Body systems dramatically improve airflow and throttle response by providing each cylinder with its own dedicated throttle plate. However, because each throttle body only generates a small and highly fluctuating vacuum signal, a vacuum manifold is required to collect and balance vacuum from all cylinders into a stable source that can be used by engine management and ancillary systems.

For Porsche enthusiasts seeking improved engine response, sharper acceleration and enhanced induction sound, the Rennen ITB system delivers one of the most desirable upgrades available for naturally aspirated Porsche engines.

What Does a Vacuum Manifold Do?

A vacuum manifold combines vacuum signals from each individual throttle body into a single, stable vacuum source.

This allows critical engine systems to operate correctly, including:

• Engine management systems
• MAP (Manifold Absolute Pressure) sensors
• Fuel pressure regulators
• Brake servo assistance systems
• Idle control systems
• Vacuum-operated accessories

By smoothing the pulsing vacuum signals generated by individual throttle bodies, the manifold improves tuning accuracy and system reliability.

Why Is an ITB Upgrade So Appealing?

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

Unlike a conventional plenum intake system, each cylinder receives air through its own dedicated throttle body, resulting in significantly improved airflow characteristics and immediate throttle response.

Benefits of a Rennen ITB upgrade include:

• Sharper throttle response
• Improved engine breathing
• Increased airflow efficiency
• Enhanced induction sound
• Greater driver engagement
• Improved tuning flexibility
• Increased performance potential
• Motorsport-inspired engine character

For many Porsche enthusiasts, the instant throttle response and distinctive intake sound are among the most rewarding aspects of an ITB conversion.

Why Replacement or Installation Matters

A properly designed vacuum manifold is essential for extracting the full benefits of an ITB conversion.

Without a stable vacuum source, engine management systems may receive inconsistent readings, affecting drivability, idle quality and tuning accuracy.

Benefits include:

• Stable vacuum signal generation
• Improved ECU calibration accuracy
• Better idle characteristics
• Consistent fuel pressure regulation
• Reliable operation of vacuum-assisted systems
• Simplified installation and plumbing
• Enhanced overall engine performance

Features & Benefits

• Designed for Rennen Individual Throttle Body systems
• Combines vacuum signals from multiple throttle bodies
• Provides stable vacuum reference source
• Supports MAP sensor operation
• Suitable for Rennen EFI conversion projects
• Improves engine management performance
• Ideal for performance and motorsport applications
• Precision-engineered for Porsche engine upgrades       

Rennen ITB Black Velocity Stacks for Air-Cooled Porsche 911 - Set of 6

Precision-Engineered Velocity Stacks Designed Exclusively for Rennen ITBs

Rennen ITB Velocity Stacks have been specifically developed for use with the innovative Rennen ITB by JSR roller barrel throttle body system. Designed to maximise airflow efficiency and complement the advanced induction characteristics of the Rennen ITB, these premium velocity stacks help optimise engine breathing, improve airflow stability and support maximum performance from your air-cooled Porsche 911 engine.

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

Manufactured to exacting standards and available in both silver and black finishes, these velocity stacks provide the perfect finishing touch for high-performance Porsche engine builds, restomods, track cars and motorsport applications.

Available Sizes and Engine Size Combinations

Each velocity stack features an overall length of 120mm and is available in three internal diameter options to suit a variety of engine specifications and performance requirements:

• 2.7ltr / 3.0ltr Engine - 45mm Internal Diameter (ID)
• 3.2ltr / 3.5ltr / 3.6ltr Engine - 48mm Internal Diameter (ID)
• 4.0ltr Engine - 50mm Internal Diameter (ID)

These sizing options allow engine builders and tuners to select the most suitable intake configuration based on engine displacement, camshaft profile, intended RPM range and performance objectives.

Optimised Airflow Performance

The carefully designed bellmouth entry profile promotes smooth airflow into the throttle body, helping reduce turbulence and improve air velocity. This allows the induction system to operate more efficiently throughout the rev range while maintaining the sharp throttle response that the Rennen ITB system is renowned for.

By creating a smoother transition for incoming air, Rennen Velocity Stacks contribute to improved cylinder filling and consistent airflow delivery across all cylinders.

Premium Construction

Designed to match the quality and engineering standards of the Rennen ITB system, these velocity stacks offer exceptional durability and an outstanding motorsport-inspired appearance.

Key Features

• Designed exclusively for Rennen ITBs by JSR
• Available in silver or black finish 120mm overall length
• Available in 45mm, 48mm and 50mm internal diameters
• Precision-machined construction
• Optimised bellmouth profile for improved airflow
• Supports enhanced induction efficiency
• Complements Rennen roller barrel throttle body systems
• Suitable for road, track and race applications
• Designed for air-cooled Porsche 911 performance engines

The Perfect Addition to Your Rennen ITB Installation

Whether you are building a fast-road Porsche 911, a high-performance restomod, or a dedicated motorsport engine, Rennen ITB Velocity Stacks provide the ideal airflow solution for your induction system. Designed specifically to work with the Rennen roller barrel throttle bodies, they help deliver the performance, drivability and appearance expected from a premium Porsche performance upgrade.

Rennen ITB Silver Velocity Stacks for Air-Cooled Porsche 911 - Set of 6

Precision-Engineered Velocity Stacks Designed Exclusively for Rennen ITBs

Rennen ITB Velocity Stacks have been specifically developed for use with the innovative Rennen ITB by JSR roller barrel throttle body system. Designed to maximise airflow efficiency and complement the advanced induction characteristics of the Rennen ITB, these premium velocity stacks help optimise engine breathing, improve airflow stability and support maximum performance from your air-cooled Porsche 911 engine.

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

Manufactured to exacting standards and available in both silver and black finishes, these velocity stacks provide the perfect finishing touch for high-performance Porsche engine builds, restomods, track cars and motorsport applications.

Available Sizes and Engine Size Combinations

Each velocity stack features an overall length of 120mm and is available in three internal diameter options to suit a variety of engine specifications and performance requirements:

• 2.7ltr / 3.0ltr Engine - 45mm Internal Diameter (ID)
• 3.2ltr / 3.5ltr / 3.6ltr Engine - 48mm Internal Diameter (ID)
• 4.0ltr Engine - 50mm Internal Diameter (ID)

These sizing options allow engine builders and tuners to select the most suitable intake configuration based on engine displacement, camshaft profile, intended RPM range and performance objectives.

Optimised Airflow Performance

The carefully designed bellmouth entry profile promotes smooth airflow into the throttle body, helping reduce turbulence and improve air velocity. This allows the induction system to operate more efficiently throughout the rev range while maintaining the sharp throttle response that the Rennen ITB system is renowned for.

By creating a smoother transition for incoming air, Rennen Velocity Stacks contribute to improved cylinder filling and consistent airflow delivery across all cylinders.

Premium Construction

Designed to match the quality and engineering standards of the Rennen ITB system, these velocity stacks offer exceptional durability and an outstanding motorsport-inspired appearance.

Key Features

• Designed exclusively for Rennen ITBs by JSR
• Available in silver or black finish 120mm overall length
• Available in 45mm, 48mm and 50mm internal diameters
• Precision-machined construction
• Optimised bellmouth profile for improved airflow
• Supports enhanced induction efficiency
• Complements Rennen roller barrel throttle body systems
• Suitable for road, track and race applications
• Designed for air-cooled Porsche 911 performance engines

The Perfect Addition to Your Rennen ITB Installation

Whether you are building a fast-road Porsche 911, a high-performance restomod, or a dedicated motorsport engine, Rennen ITB Velocity Stacks provide the ideal airflow solution for your induction system. Designed specifically to work with the Rennen roller barrel throttle bodies, they help deliver the performance, drivability and appearance expected from a premium Porsche performance upgrade.