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

![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/a0891227-bd99-4878-87de-3cd027e12c62-jpg.webp)
![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/04eedca4-77d6-4f00-adbc-38548e8a7f01-jpg.webp)
![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/d30a9db4-9cb6-4931-a7f5-38b25da2a495-jpg.webp)
![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/a30e20ce-05ac-48eb-a4ec-2b867c49842e-jpg.webp)
![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/1bd06a00-5525-4bc8-ac6e-f15ce9a4a842-jpg.webp)
![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/52b3e13d-14a5-4515-822f-ee582b8ab1ee-jpg.webp)
![4.1 Dual RCT S/S CRF250R 14- 17 Slip Ons w/carbon caps []](https://boydsassets.specd.nz/uploads/2026/09/d3c175ac-80c3-4cec-b691-0a8c347a10b6-jpg.webp)




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