Factory 4.1 RCT Exhaust SystemIncorporates FMF Resonance Chamber Technology™ both internally and externallyShorter overall length that is less susceptible to crash damage and complementary to Factory Forward Engineering, moving the muffler closer to the motor to centralize massConstructed from only aerospace grade materials that meet exacting specifications and is manufactured 100% at the southern California factorySpark arrestor screen insert included94dB insert includedFor closed course competition only