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.
- Can be used with FMF or Stock OEM Header

![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/cc800166-d5c6-44b6-9c8c-25991a107494-jpg.webp)
![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/ef72666d-e911-4483-bfca-86fbd90771f0-jpg.webp)
![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/b41797d0-3abd-4d47-ba75-57d08582c78e-jpg.webp)
![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/72ed6bd6-0957-424c-a8c5-dc24c72d9f3b-jpg.webp)
![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/a2432de9-34cf-4b34-b3c3-6f7d8537d337-jpg.webp)
![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/408175a6-4b3f-4f13-8d6e-0ec97e9d4142-jpg.webp)
![I 4.1 RCT Ti YZ250F 14/18 Anod Slip On w/carbon cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/df3c9b80-af66-483e-ad7d-26020622d050-jpg.webp)




Reviews
There are no reviews yet.