The FMF Factory 4.1 RCT slip-on exhaust is engineered for Honda CRF450R and CRF450RX models, delivering tuned performance with refined sound control. Featuring FMF Resonance Chamber Technology, this exhaust uses a patented core shape to reduce sound output while maintaining strong power. Its patented canister design increases internal volume for additional sound-absorbing material, while the chamber configuration helps enhance and refine exhaust pressure throughout the powerband.
Factory Forward Engineering centralizes the exhaust mass to improve handling characteristics and reduce exposure to crash damage. The application-specific core specifications are tuned for the Honda CRF450 platform, supporting consistent performance on motocross and off-road race machines. The innovative rear end cap allows straightforward installation of tuning tip inserts or the included spark arrestor, helping adapt the exhaust system to different riding environments.
This FMF part number 041603 configuration includes a titanium canister and titanium mid-pipe, along with a spark arrestor and wash plug. It is designed as a slip-on replacement for the original muffler and fits 2021 through 2025 Honda CRF450R and CRF450RX models. Verify the exact year and model before installation to ensure proper fitment.
Features:
- Resonance Chamber Technology helps control sound while maintaining maximum power output
- Patented core shape lowers sound levels without sacrificing performance
- Patented canister shape provides additional internal volume for sound-absorbing material
- Patented chamber design enhances and refines exhaust pressure
- Factory Forward Engineering centralizes mass and helps reduce crash damage
- Application-specific tuned core specifications support optimized performance
- Innovative rear end cap simplifies installation of tuning tip inserts or a spark arrestor
- Titanium canister and titanium mid-pipe construction
- Includes spark arrestor and wash plug
- Fits 2021-2025 Honda CRF450R and CRF450RX models
Fitment:
2021 Honda CRF450R
2021 Honda CRF450RX
2022 Honda CRF450R
2022 Honda CRF450RX
2023 Honda CRF450R
2023 Honda CRF450RX
2024 Honda CRF450R
2024 Honda CRF450RX
2025 Honda CRF450R
2025 Honda CRF450RX
2026 Honda CRF450R
2026 Honda CRF450RX