FMF Factory 4.1 RCT Complete Exhaust System — Yamaha YZ450F 2026

Header and muffler tuned as one unit: broader pull out of corners, a lighter overall package, and the throttle response FMF's factory race team chases.

Fits: Yamaha YZ450F 2026.

Why riders pick it:

• RCT (Resonance Chamber Technology) tuning throughout the header and muffler
• Matched MegaBomb header widens the powerband and sharpens throttle response
• Aerospace-grade materials shave significant weight off the complete system
• Direct bolt-on installation, no tuning required

⚠️ For closed-course competition / off-road use only — not legal for street use in some states. Confirm your local regulations.

Not sure it fits your bike? Send us your year and model and we'll confirm.