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.

![I 4.1 Dual RCT S/S CRF250R 14 17 FMF Full System w/carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/d6b548a8-c3eb-4975-9651-d2681430bd7f-jpg.webp)
![I 4.1 Dual RCT S/S CRF250R 14 17 FMF Full System w/carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/362dd903-7d39-4794-ac29-e4716cc86f83-jpg.webp)
![I 4.1 Dual RCT S/S CRF250R 14 17 FMF Full System w/carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/d41733ff-5781-4988-9dff-9d0990b65cde-jpg.webp)
![I 4.1 Dual RCT S/S CRF250R 14 17 FMF Full System w/carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/1b08d5d9-074b-4c32-b013-82f1d2c0f577-jpg.webp)
![I 4.1 Dual RCT S/S CRF250R 14 17 FMF Full System w/carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/b4ef5699-44da-493e-83d8-79741fcf2dcd-jpg.webp)




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