19-21 450SXF FS AL 4.1 RCT SS MGBMB HDR

The Factory 4.1 RCT is constructed from only aerospace grade materials that meet FMF's exacting specifications and is manufactured 100% at their Southern California factory Massive Power gains throughout the RPM range. New RTS (Rapid Tuning System) Huge weight savings Includes spark arrestor screen insert Shorter overall length that is less susceptible to crash damage and complementary to FMF's Factory Forward Engineering - moving the muffler closer to the motor to centralize mass The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externally Includes MegaBomb header