In-stock, open-box FMF Factory 4.1 RCT exhaust system featuring lightweight titanium construction and a premium carbon fiber end cap—designed exclusively for the Yamaha YZ450F (2023–2025)

Description

• 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

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