FMF Factory 4.1 RCT Complete System (w/ Stainless MegaBomb Header) — Honda CRF450R/CRF450RX 2021–2026

A matched header and muffler working together — this complete FMF system reshapes the powerband from the pipe back and cuts a serious amount of weight versus stock.

Fits: Honda CRF450R/CRF450RX 2021–2026.

Why riders pick it:

• RCT (Resonance Chamber Technology) tuning throughout the header and muffler
• Durable stainless steel MegaBomb header widens the powerband and sharpens throttle response
• Aerospace-grade muffler 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.