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Porsche > 911 & 912 (1965-1989) > Engine Tuning >

Electronic Fuel Injection Throttle Kits

Electronic Fuel Injection Throttle Kits

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DISPLAYING 33 to 34 (of 34 products)
1 2 3
Velocity Stack Set Black for Rennen ITB. Porsche 911 / 964
3
Velocity Stack Set Black for Rennen ITB. Porsche 911 / 964
ITBVS120B
Product Information
Product Information

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.

Velocity Stack Set Silver for Rennen ITB. Porsche 911 / 964
3
Velocity Stack Set Silver for Rennen ITB. Porsche 911 / 964
ITBVS120
Product Information
Product Information

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.

DISPLAYING 33 to 34 (of 34 products)
1 2 3
About Electronic Fuel Injection Throttle Kits

Porsche Electronic Fuel Injection Throttle Kits - Precision Airflow & Throttle Control

Electronic Fuel Injection (EFI) Throttle Kits upgrade the engine’s air delivery system, providing precise throttle control, improved airflow, and enhanced engine response. Designed for performance builds, engine conversions, and modernised classic Porsche applications, these kits replace restrictive or outdated throttle systems with advanced electronic throttle bodies and control hardware.

Available from Design911, Porsche EFI throttle kits are engineered to deliver smoother power delivery, sharper throttle response, and improved drivability—especially in tuned, high-performance, or track-focused engines.

What Do Electronic Fuel Injection Throttle Kits Do?

EFI throttle kits regulate the volume of air entering the engine with high precision, directly influencing power and response.

Core Functions:

  • Control engine airflow electronically and accurately.
  • Improve throttle response and drivability.
  • Support higher airflow demands in tuned engines.
  • Enable precise fuel and ignition mapping.
  • Enhance overall engine efficiency and performance.

Accurate throttle control is essential for modern performance engine management.

Why Do Standard Throttle Systems Fail?

Factory or older throttle systems can become limiting or unreliable over time, particularly in modified engines. Common issues include:

  • Mechanical throttle wear or cable stretch.
  • Inconsistent airflow from ageing throttle bodies.
  • Restrictive designs limiting high-RPM performance.
  • Poor compatibility with modern ECU tuning.
  • Inadequate response for high-performance applications.

These limitations can result in sluggish response, uneven power delivery, and reduced tuning potential.

Why Upgrade to an EFI Throttle Kit?

EFI throttle kits are designed to support modern engine management and higher performance demands.

Upgrade Benefits:

  • Sharper, more consistent throttle response.
  • Increased airflow capacity for power upgrades.
  • Improved compatibility with aftermarket ECUs.
  • Enhanced drivability for road and track use.
  • Ideal for engine builds, conversions, and restorations.

Upgrading to an EFI throttle kit unlocks precise control and maximises engine tuning potential.

Highlights

  • Porsche electronic fuel injection throttle kits
  • Precision airflow and throttle control upgrades
  • Designed for tuned and performance engines
  • Improved response, drivability, and power delivery
  • Compatible with modern ECU management systems       

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