Plenum Adaptor Flange Set for Rennen ITB Upgrade 3.2ltr and Above. Porsche 911 / 964  ❭  ITBPF911964

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