Description
Factory 4.1 RCT Slip-On Offroad Muffler
- The Factory 4.1 RCT incorporates FMF’s Resonance Chamber Technology™ both internally and externally
- In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their 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 their exacting specifications and is manufactured 100% at their Southern California factory
- Massive Power gains throughout the RPM range.
- Huge weight savings
- RTS (Rapid Tuning System)

![FMF Racing Factory 4.1 RCT Anodized Titanium Slip-On with Carbon Fiber End Cap YZ250F [MPN: 044455]](https://www.partsodyssey.com/wp-content/uploads/2026/03/fmf-racing-factory-4-1-rct-anodized-titanium-slip-on-with-carbon-fiber-end-cap-yz250f-mpn-044455-ylnphhor69584.webp)
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