It all began in 2019, when a couple of Porsche enthusiasts set out to modernise their own 911 with EFI.
JSR Engineering was founded by Jannik and René, both with backgrounds in mechanical engineering and manufacturing. United by a deep passion for Porsche and all things mechanical, they maintain several development cars in constant evolution, with at least one always ready for a spirited drive.
Fast forward to 2025, and JSR’s ITB system has found a natural home at Rennen Motorsport in Australia, a workshop where performance parts are judged by use, not theory.
Adopted across Rennen’s own air cooled Porsche builds, the system has been tested
and refined in real road, track, and competition environments. This hands on experience led to the system being offered locally as Rennen ITBs by JSR, a solution backed by engineering design and proven under demanding conditions. Rather than a catalogue product, it reflects a shared, engineering led approach focused on usable, repeatable Porsche performance. Now ready and seeking worldwide distributors with a passion for Porsche performance.
“PERFORMANCE PARTS ARE JUDGED BY USE, NOT THEORY.”
