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

![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/69d6220f-70aa-46cb-81fb-64b01675acf9-jpg.webp)
![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/684a70f8-f78d-4b9b-946a-cb87aa857f46-jpg.webp)
![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/7113d9f3-7cb7-42e1-81b5-e0529e161c36-jpg.webp)
![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/9c6d68ae-cd23-4500-850d-09ab5db10a34-jpg.webp)
![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/da42a382-d6fc-4c66-9387-d4438aac91df-jpg.webp)
![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/097a51ec-7efa-4607-aebf-1ea1743f8a3e-jpg.webp)
![FMF FACTORY 4.1 HEX/RCT S/A INSERT []](https://boydsassets.specd.nz/uploads/2026/09/89253ce2-76cc-43a5-899b-39ba755c06f0-jpg.webp)




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