Description

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.
- Available in Natural Aluminum Muffler with Carbon End Cap
- Massive Power gains throughout the RPM range.
- Huge weight savings
- New RTS (Rapid Tuning System)
- FMF uses the highest quality proprietary blend of alloy grade titanium made especially to our standards.

![4.1 RCT Ti YZ450F 14-17 Anod System M-B Carb/cap []](https://boydsassets.specd.nz/uploads/2026/09/41c399d7-ee5c-4217-b3a4-e2978a730f3d-jpg.webp)
![4.1 RCT Ti YZ450F 14-17 Anod System M-B Carb/cap []](https://boydsassets.specd.nz/uploads/2026/09/e2b5ca2b-a711-4759-bd1c-76ba77505c3d-jpg.webp)
![4.1 RCT Ti YZ450F 14-17 Anod System M-B Carb/cap []](https://boydsassets.specd.nz/uploads/2026/09/78bcb9da-0a2e-4cff-b9be-a16fbde1ab99-jpg.webp)
![4.1 RCT Ti YZ450F 14-17 Anod System M-B Carb/cap []](https://boydsassets.specd.nz/uploads/2026/09/0e224467-14ba-450d-a188-349cf77be7f6-jpg.webp)
![4.1 RCT Ti YZ450F 14-17 Anod System M-B Carb/cap []](https://boydsassets.specd.nz/uploads/2026/09/5dd1cef9-0c84-44b6-8aad-bb850f9085e9-jpg.webp)




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