The FMF Racing Factory 4.1 RCT is a 4-stroke muffler constructed from blue anodized titanium with a carbon end cap. This unit utilizes FMF Resonance Chamber Technology both internally and externally to deliver power gains throughout the RPM range. The design features a shorter overall length intended to reduce susceptibility to crash damage, while the Factory Forward Engineering approach positions the muffler closer to the motor to centralize mass.
The system includes the Rapid Tuning System (RTS) for adjustability. FMF states that the Factory 4.1 RCT is manufactured using aerospace grade materials that meet their specifications. Production is completed 100% at the company's Southern California factory.