What is Rennen ITBs by JSR?

Rennen ITBs by JSR is an individual throttle body system developed by JSR Engineering and offered through Rennen Motorsport. It is designed specifically for air-cooled Porsche engines, with a focus on airflow efficiency, drivability, and repeatable real-world performance rather than theoretical peak numbers.

What type of Porsche builds is the system suited for?

The system is designed for air-cooled Porsche engines where usability, consistency, and performance must work together. It suits fast road cars as well as competition-focused builds that demand precise throttle control