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 CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/f1790340-03b1-47d2-8fe2-126d8ef7af50-jpg.webp)
![4.1 Dual Ti CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/b3cfa3ba-2de2-4e80-8275-8bff352b4d50-jpg.webp)
![4.1 Dual Ti CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/941c842b-6052-4759-a562-4fdc838288be-jpg.webp)
![4.1 Dual Ti CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/ae589812-d39f-4eea-8574-8e7840aa522f-jpg.webp)
![4.1 Dual Ti CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/c12f5b96-4835-4f90-b30b-775fd556a2c1-jpg.webp)
![4.1 Dual Ti CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/f5f7f430-8e33-4122-ac8c-44e7fb558941-jpg.webp)
![4.1 Dual Ti CRF450R 2019/20 System with MBomb Header FMF []](https://boydsassets.specd.nz/uploads/2026/09/d5971f4d-da64-4673-8c75-66cfc60d5129-jpg.webp)




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