The FMF Q4 HEX S/A 045667 slip-on exhaust exemplifies advanced quiet technology for off-road motorcycles. Designed to significantly reduce sound while maximising power output, this exhaust integrates proprietary multistage packing, specially engineered chambers, and baffles. Lightweight and highly durable, it brings enhanced performance across the full rpm range, making it ideal for riders who demand both stealth and speed without compromising endurance.

Features

• Advanced quiet technology for reduced sound


• Meets USFS and FIM World Enduro sound regulations


• Increases power across the entire rpm range


• Includes screen-type spark arrestor and 94dB quiet insert


• Lightweight construction, pounds lighter than OEM systems


• Rugged, off-road-ready design


• Made exclusively in the USA


• Notice: Closed Course Use Only

Specifications

• Item ID: 045667


• Type: Slip-On


• Configuration: Single


• Construction: Aluminium


• Finish: Natural


• Midpipe: Stainless Steel


• Endcap: Stainless Steel


• Spark Arrestor: Screen insert (included)


• Quiet Insert: 94dB (included)


• Weight: 7.3 lbs


• Carb Warning: No

Vehicle Fitment

BETA

• 350RR (2020–2025)


• 390RR (2020–2025)


• 430RR (2020–2025)


• 480RR (2020–2025)