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

The full FMF system — header, resonance chamber, and muffler engineered together for real power gains and a meaningful drop in exhaust weight.

Fits: Honda CRF450R/CRF450RX 2021–2026.

Why riders pick it:

• RCT (Resonance Chamber Technology) tuning throughout the header and muffler
• Lightweight titanium MegaBomb header widens the powerband and cuts more weight than stainless
• 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.