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 Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/36f50c16-82b0-4dcc-88ee-caf7d00f8f51-jpg.webp)
![I 4.1 RCT Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/b126b98c-6859-4434-a9de-1c35abe80a77-jpg.webp)
![I 4.1 RCT Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/1de85185-60e9-4556-b205-fd516b4f30bf-jpg.webp)
![I 4.1 RCT Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/171d143a-bb62-4f3e-ab2e-7fd767ab00ee-jpg.webp)
![I 4.1 RCT Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/66540e77-8ff8-4f32-ab0f-dd319e677455-jpg.webp)
![I 4.1 RCT Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/85e9cbf9-a9d3-4898-afca-69c1544a3bd5-jpg.webp)
![I 4.1 RCT Ti 350EXC-F 12-16 500EXC Slip On Muffler []](https://boydsassets.specd.nz/uploads/2026/09/d328e744-486a-482f-ac09-3c6fc1f95af4-jpg.webp)




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