Part Description: Yamaha YZ450F 2020-2022. YZ450FX 2019-2023. The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology both internally and externally.
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 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.
Huge weight savings.
New RTS (Rapid Tuning System).
Includes MegaBomb header.
Includes spark arrestor screen insert.
