do not press the back button…
Your Vehicle
Porsche // 356 (1950-1965) // 356C 1963-65
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
- 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
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.