FMF Factory 4.1 RCT Slip-On Muffler delivers massive power gains across the RPM range with huge weight savings in a compact, crash-resistant design. Built from aerospace-grade titanium with a carbon-fiber end cap and FMF RCT Resonance Chamber Technology.
The FMF Factory 4.1 RCT Slip-On Muffler is a premium performance upgrade designed to boost power throughout the entire RPM range while significantly reducing overall weight. By using FMF’s Resonance Chamber Technology™ (RCT) both internally and externally, it helps deliver strong, responsive performance with a refined exhaust character.
Its shorter overall length is less susceptible to crash damage, and FMF’s Factory Forward Engineering positions the muffler closer to the engine to help centralize mass—ideal for riders who want sharper handling feel and a more race-focused setup. Manufactured 100% in FMF’s Southern California facility, it’s built from aerospace-grade materials to meet demanding off-road riding conditions.
