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 S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/3a5393eb-0396-4c5e-b6d3-6a7c972e2308-jpg.webp)
![I 4.1 RCT S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/821c7595-7f73-482a-8b22-93c5de89dcb6-jpg.webp)
![I 4.1 RCT S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/66c9b103-a722-42bc-85de-48e4f82e7c3e-jpg.webp)
![I 4.1 RCT S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/d9120058-23fc-4545-9115-374edfcaac75-jpg.webp)
![I 4.1 RCT S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/25dd11e2-f655-42ae-b4b2-c61ec2f2809b-jpg.webp)
![I 4.1 RCT S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/4226fabf-ae0a-41ec-956c-c15c4ffb58aa-jpg.webp)
![I 4.1 RCT S/S CRF250R 14-17 FMF Single w/c cap & s-panel []](https://boydsassets.specd.nz/uploads/2026/09/23fd0e47-bd00-489e-a8db-3d0db63718c9-jpg.webp)




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