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Performance Individual Throttle Bodies, for your air-cooled Porsche 911

Elliptical Roller Barrel ITB systems. CNC machined from EN-AW 6082-T6 aluminium with hard anodized finish. Engineered for maximum performance and reliability.

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Why choose Rennen ITB’s by JSR

CNC Machined

All parts are precision-machined from EN-AW 6082-T6 aluminium


Hard Anodized

Durable hard anodized finish for long-lasting performance

Complete System

Includes throttle linkage, rod ends, and fuel rails


Proven Results

Significant power gains verified by dyno testing

Our ITB Systems

Choose the perfect system for your engine configuration

Small Bore ITB System (2.7 - 3.0L • 2-stud)

Medium Bore ITB System (3.2 - 3.6L • 2-stud or 3-stud)

Large Bore ITB System (3.6 - 4.0L • 3-stud)

What's Included

All Rennen ITB’s by JSR systems include:

  • Roller Barrel Throttle Bodies with a hard anodized finish

  • Complete throttle linkage, including rod ends

  • Fuel rails with a bracket for short or long injectors

  • Ready to fit - no modifications needed

  • Custom bore sizes available on request

Optional add-ons available: stacks/trumpets and plenum flanges in various sizes.