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 Dual RCT S/S CRF450R 15- 16 FMF w C/Cap + S/S M-Bomb []](https://boydsassets.specd.nz/uploads/2026/09/eb76a265-5396-4f73-9426-eb9ebe9f28a8-jpg.webp)
![4.1 Dual RCT S/S CRF450R 15- 16 FMF w C/Cap + S/S M-Bomb []](https://boydsassets.specd.nz/uploads/2026/09/c2458ee7-63fb-4e29-9642-e27da51637ed-jpg.webp)
![4.1 Dual RCT S/S CRF450R 15- 16 FMF w C/Cap + S/S M-Bomb []](https://boydsassets.specd.nz/uploads/2026/09/76f10079-3efb-417c-b6ce-8d479a5c9875-jpg.webp)
![4.1 Dual RCT S/S CRF450R 15- 16 FMF w C/Cap + S/S M-Bomb []](https://boydsassets.specd.nz/uploads/2026/09/fec6a661-ee52-4b5f-9afe-67f2f860bf88-jpg.webp)
![4.1 Dual RCT S/S CRF450R 15- 16 FMF w C/Cap + S/S M-Bomb []](https://boydsassets.specd.nz/uploads/2026/09/37e046b7-2c28-4fdd-a70a-bc62607d1a10-jpg.webp)




Reviews
There are no reviews yet.