FMF 041604 - FMF Factory 4.1 RCT Stainless Steel Exhaust System For Honda CRF450R 2021-20

Features: RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output. Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power. FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage. Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws. Meets AMA and FIM sound requirements. QuietCore 94 dB insert included. Made in the U.S.A.. NOTE: Will not pass 2025 FIM sound regulation.