Incorporates FMF Resonance Chamber TechnologyÖ both internally and externally Shorter overall length that is less susceptible to crash damage and complementary to Factory Forward Engineering, moving the muffler closer to the motor to centralize mass Constructed from only aerospace grade materials that meet exacting specifications and is manufactured 100% at the southern California factory Spark arrestor screen insert included 94dB insert included For closed course competition only. EXHAUST ALUM F4.1 RCT CARBON CAP SS MB HEADR/MID YZ450F
