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 Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/e6c828c0-536a-4cbd-8c98-c6b132606ae4-jpg.webp)
![!4.1 Dual Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/d9dfa531-7c93-48d1-bbe9-62a7c315b3fd-jpg.webp)
![!4.1 Dual Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/d6b70d44-de40-4f4e-b528-384bc93a9d7a-jpg.webp)
![!4.1 Dual Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/d1487d8b-2aa3-4f7d-bab0-2c719e99feb7-jpg.webp)
![!4.1 Dual Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/f9df8f6b-e26d-4364-8bb9-db24d91061ff-jpg.webp)
![!4.1 Dual Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/acbd590a-671e-4cec-90b3-e3082e546f78-jpg.webp)
![!4.1 Dual Ti CRF250R 2018-21 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/a8f3121a-dee7-447d-86ee-a7999f8cd085-jpg.webp)




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