- 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)
Yamaha -- YZ 450 FX -- (2020, 2021, 2022, 2023, 2019); Yamaha -- YZ 450 F -- (2021, 2022, 2024, 2023, 2018, 2019, 2020); Yamaha -- WR 450 F -- (2019)
