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 Ti Single CRF450R 17-20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/75c31bb9-92e9-4dd9-bd4d-b574df3c5a5a-jpg.webp)
![!4.1 Ti Single CRF450R 17-20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/9f0a8887-e11b-4d71-8dde-18b0807f7510-jpg.webp)
![!4.1 Ti Single CRF450R 17-20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/1199eb54-8c3f-4962-a2fd-e4fe0dfa0792-jpg.webp)
![!4.1 Ti Single CRF450R 17-20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/e104ec9e-ab62-4a11-94b4-4e24dab42049-jpg.webp)
![!4.1 Ti Single CRF450R 17-20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/113ab7a8-ebbd-4d1c-93f3-d707c162d8ba-jpg.webp)




Reviews
There are no reviews yet.