FMF 05-09,12-16 CRF450X SS F4.1 RCT SO AL/AL

The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externally

In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their Factory Forward Engineering - moving the muffler closer to the motor to centralize mass

The Factory 4.1 RCT is constructed from only aerospace grade materials that meet their exacting specifications and is manufactured 100% at their Southern California factory

Massive Power gains throughout the RPM range.

Huge weight savings

RTS (Rapid Tuning System)