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 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/12132139-000e-4924-9907-0b033f6fabd2-jpg.webp)
![I 4.1 RCT 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/aea4c381-bbe2-4800-82c1-630b01fd83d7-jpg.webp)
![I 4.1 RCT 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/ffba0420-97ae-4a4b-b952-a46c7b4a42e8-jpg.webp)
![I 4.1 RCT 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/7b81355d-a200-40fe-8067-00fd6c0a442e-jpg.webp)
![I 4.1 RCT 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/da8cc874-21f9-4637-a698-c843fc9548fd-jpg.webp)
![I 4.1 RCT 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/003247a1-4dd2-48bc-8151-9050a2dce659-jpg.webp)
![I 4.1 RCT 350/450SXF 19-21 Ti FC350/450 Slip On w/Carb Cap[]](https://boydsassets.specd.nz/uploads/2026/09/ad6608e2-752e-4419-aac5-e29abc68d972-jpg.webp)




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