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 RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/f9623652-cc62-46cb-a35c-1ee48937094d-jpg.webp)
![I 4.1 RCT Ti RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/353cbada-d338-42dd-aed7-e7a442730dc0-jpg.webp)
![I 4.1 RCT Ti RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/138dcec3-8ae4-48ee-b310-855612a5baab-jpg.webp)
![I 4.1 RCT Ti RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/2b8ae469-bbde-4b46-970a-95bff636bc6d-jpg.webp)
![I 4.1 RCT Ti RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/b3c8e1f7-d759-4475-9601-786561a269ab-jpg.webp)
![I 4.1 RCT Ti RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/e6861fb7-a728-44ea-a2c3-0420490ab8ab-jpg.webp)
![I 4.1 RCT Ti RMZ250 13-18 Slip on with Carbon Cap FMF []](https://boydsassets.specd.nz/uploads/2026/09/a18c0f8d-414a-4d4c-9439-12f09112c5c5-jpg.webp)




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