The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology(TM) 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. Notice:Closed Course Use OnlyItem ID:045713Type:Slip-OnConfiguration:SingleConst:AluminumFinish:Gray AnodizedMidpipe:Stainless SteelEndcap:CarbonSpark Arrestor:Screen Insert (included)Carb Warning:noQuiet Insert:94dB Insert (included)