The FMF Q4 HEX S/A is a slip-on muffler for the 2027 Honda CRF450R and CRF450RX. It replaces the muffler section of the exhaust to reduce sound during off-road riding; it is not a complete exhaust system with a header. Made in the USA, it is designed for off-road endurance.

Features

• Internal chambers, baffles and multistage packing are designed to reduce exhaust sound while maintaining performance.
• Check header compatibility separately before ordering.

Specifications

• Canister: grey-anodised aluminium.
• Mid-pipe and end cap: stainless steel.
• FMF states that the muffler meets USFS and FIM World Enduro sound regulations.

Kit Contents

• One slip-on muffler.
• Screen-type spark-arrestor insert.
• Quiet insert.

Cross-Reference OEM Part Numbers

• FMF: 041637.

Vehicle Fitments

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