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

![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/f64a44fd-61ed-47fd-bcdc-7c24f2ce6bb1-jpg.webp)
![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/bd4aa44b-b161-426b-9647-5a028489bfc0-jpg.webp)
![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/b8381dd5-ed36-4fa8-9bb1-bec667a709d7-jpg.webp)
![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/f866d44d-c35a-4629-9f7b-d73f98132124-jpg.webp)
![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/f1164447-ce89-4c0f-8e61-e626bb89d117-jpg.webp)
![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/b20b0881-9149-4472-973f-ee9c02285cec-jpg.webp)
![I 4.1 RCT S/S RMZ450 11-17 FMF Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/b66df6c9-55ea-4f49-be59-a073df90196c-jpg.webp)




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