23-24 YZ450F FACT RCT4.1 FS SS/AL

BRAND: FMF

• Incorporates FMF Resonance Chamber Technology™ 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