The FMF Factory 4.1 RCT is a single slip-on exhaust muffler for the 2027 Honda CRF450R and CRF450RX. It replaces the muffler section rather than the complete exhaust system. It is manufactured at FMF’s Southern California factory.

Features

• Resonance Chamber Technology (RCT) is designed to improve power delivery.
• Shorter, forward-positioned muffler design is intended to centralise mass and reduce exposure to crash damage.
• Features FMF’s Rapid Tuning System (RTS).
• Includes a screen-insert spark arrestor for use where one is required; check local requirements before riding.

Specifications

• Blue-anodised titanium muffler body.
• Titanium mid-pipe.
• Blue carbon end cap.

Cross-Reference OEM Part Numbers

• FMF part number: 041639.

Vehicle Fitments

• Honda CRF450R: 2027.
• Honda CRF450RX: 2027.