FMF - Q4 Hex Spark Arrestor Muffler (Beta)

FMF – Q4 Hex Spark Arrestor Muffler (Beta)

The FMF Q4 Hex Spark Arrestor Muffler is built for riders who want quieter performance without giving up power. Designed using FMF’s proven quiet-core technology, it uses a system of tuned chambers, baffles, and proprietary multi-stage packing to reduce sound while still improving throttle response and pull. It’s rugged, reliable, and purpose-built for off-road riding where noise limits and spark arrestors are mandatory.

Why We Like It

It’s one of the few mufflers that actually cuts noise without killing power. The sound is controlled, the fit is clean, and the build quality holds up to real off-road abuse. For Beta riders who want performance without excessive volume, the Q4 has been a proven favorite for years.

Why It’ll Work for You

If you ride public trails, race enduro, or just want a quieter bike, the Q4 makes things simple. It boosts power across the range, meets USFS and FIM sound requirements, includes a spark arrestor, and weighs less than stock. It installs easily and gives your Beta a smoother, more controlled feel without drawing unwanted attention.

Key Features

• Less sound with strong overall performance
  
  
• Meets USFS and FIM World Enduro sound regulations
  
  
• Power gains throughout the entire RPM range
  
  
• Spark arrestor included
  
  
• Lighter than stock mufflers
  
  
• Rugged construction for off-road endurance
  
  
• Only U.S. manufacturer offering dedicated quiet exhaust systems
  
  
• Made in the USA