FOR CLOSED COURSE COMPETITION USE ONLY. NOT INTENDED FOR STREET USE.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 Blue Anodized Titanium Muffler with Titanium 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. Notice: For Closed Course Competition Use Only. Not Intended for Street Use.