The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our 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 our exacting specifications and is manufactured 100% at our Southern California factory.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 2019-2026 |
Yamaha |
WR450F |
Base |
| 2018-2026 |
Yamaha |
YZ450F |
Base |
| 2024 |
Yamaha |
YZ450F 50th Anniversary Edition |
Base |
| 2026 |
Yamaha |
YZ450F 70th Anniversary Edition |
Base |
| 2021-2023,2025 |
Yamaha |
YZ450F Monster Energy Yamaha Racing Edition |
Base |
| 2018-2026 |
Yamaha |
YZ450FX |
Base |
