Factory 4.1 RCT Slip-On MufflerThe Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externallyIn addition, 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 massThe Factory 4.1 RCT is constructed from only aerospace grade materials that meet our exacting specifications and is manufactured 100% at our Southern California factorySpark arrestor and quiet insert (94db) included