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 RCT RMZ450 11-17 Full System w/Ti M-B Carb cap []](https://boydsassets.specd.nz/uploads/2026/09/a927efb5-6a7c-45d2-94b9-d3ee254ff10d-jpg.webp)
![4.1 RCT RMZ450 11-17 Full System w/Ti M-B Carb cap []](https://boydsassets.specd.nz/uploads/2026/09/911c8a2c-7d88-4a73-b211-8ce35ddbb8f1-jpg.webp)
![4.1 RCT RMZ450 11-17 Full System w/Ti M-B Carb cap []](https://boydsassets.specd.nz/uploads/2026/09/85b9ee33-9cb1-4914-918a-c994bc59650c-jpg.webp)
![4.1 RCT RMZ450 11-17 Full System w/Ti M-B Carb cap []](https://boydsassets.specd.nz/uploads/2026/09/669fde62-a03f-41c8-841a-36e534beaa74-jpg.webp)
![4.1 RCT RMZ450 11-17 Full System w/Ti M-B Carb cap []](https://boydsassets.specd.nz/uploads/2026/09/5d79f208-6cc6-484d-affd-b967db108baa-jpg.webp)




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