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:
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 |
