FMF 21-23 CRF450R EXHST 4.1RCT AN MGBM

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

QuietCore 94 dB insert included

Made in the U.S.A.

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