Suzuki Jimny FI Exhaust Catless Downpipe + Valvetronic Catback System BMW F90 M5 FI Exhaust Catless Downpipe Valvetronic Catback System Suzuki Jimny FI Exhaust Catless Downpipe + Valvetronic Catback System Exhaust Fi Shop. Experience uncompromised performance for your Porsche 992. 1 GT3 or GT3 RS with the Fi Exhaust Catless Header + Valvetronic Muffler + Dual Silver Tips Race Version. This system features free flowing catless race headers designed to maximize exhaust velocity, reduce backpressure, and unlock sharper throttle response and increased power. The Fi Valvetronic muffler retains full OEM valve functionality, allowing you to switch between a refined cruising note and an aggressive, race inspired sound profile. Finished with dual polished silver tips, this setup elevates both performance and aesthetics. Engineered specifically for 2021+ 992. 1 GT3 RS models, this race focused exhaust delivers exceptional craftsmanship, precision fitment, and the exhilarating sound these cars deserve.