The FMF Q4 HEX S/A 042393 exhaust sets the benchmark for high-performance quiet technology in off-road riding. Engineered with advanced chambering, baffles, and exclusive multi-stage packing material, this slip-on system delivers substantial power gains across the RPM spectrum while strictly adhering to stringent noise regulations. Lighter than stock and equipped with a built-in spark arrestor, the Q4 HEX is ideal for riders demanding durable, USFS/FIM-compliant, low-sound performance. Proudly manufactured in the USA, it enhances your machine’s capabilities without compromising on silence.

Features

• Incorporates quiet technology for reduced sound output and increased access to noise-controlled areas
• Meets USFS and FIM World Enduro sound requirements for legal off-road use
• Significant power increases throughout the entire RPM range
• Supplied with integrated spark arrestor for added safety
• Lighter than most OEM systems, improving handling and responsiveness
• Robust construction designed for demanding off-road conditions
• Only US manufacturer providing purpose-built quiet exhausts
• Manufactured in the USA

Specifications

• Notice: Closed Course Use Only
• Item ID: 042393
• Type: Slip-On
• Configuration: Single
• Construction: Aluminium
• Finish: Natural
• Midpipe: Stainless Steel
• Endcap: Stainless Steel
• Spark Arrestor: Screen Insert (included)
• Carb Warning: No
• Quiet Insert: Included
• Weight: 6.9 lbs

Vehicle Fitment

Kawasaki

• KX250F (2021–2024)
• KX250X (2021–2024)