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 Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/56674855-0ef2-4345-992d-13d887485097-jpg.webp)
![4.1 Dual Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/b30819e2-4c0c-4d95-af31-0c651afa62ff-jpg.webp)
![4.1 Dual Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/1005a26d-6479-424b-9b66-94eedead1e24-jpg.webp)
![4.1 Dual Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/3b537caf-16a2-4c44-87cf-42b031058835-jpg.webp)
![4.1 Dual Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/853877dc-f1a1-462d-8f6e-9db068b7f8a6-jpg.webp)
![4.1 Dual Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/fe505a0a-0a9f-4667-8dce-7f770c3dd756-jpg.webp)
![4.1 Dual Ti CRF250R 2018-21 System with MBomb Header []](https://boydsassets.specd.nz/uploads/2026/09/19f0189d-c195-46bc-99af-4fe8424f70cf-jpg.webp)




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