Fast Pro universal hexagon slip-on muffler 390mm, 1.5–2" inlet — fits scooters, ATVs, dirt & street bikes

Fast Pro’s universal hexagon slip‑on exhaust is a 390mm, 1.5–2" (38–51mm) inlet muffler pipe designed to replace or upgrade the exhaust on scooters, ATVs, dirt bikes and street bikes.

This slip‑on muffler from Fast Pro is built for riders who need a straightforward, affordable exhaust option that fits a wide range of bikes. With a 390mm body and a multipurpose connection diameter that spans 38mm to 51mm, it’s intended as a direct replacement or a performance‑style upgrade where exact fitment flexibility matters. The kit ships with the pipe and necessary mounting hardware so you can install it on many frames; basic tools and mechanical familiarity are recommended.

Will this muffler fit my scooter, ATV or dirt bike?

Yes — the design is deliberately universal to cover common exhaust outlet sizes. The inlet accepts pipes from 38mm up to 51mm (approximately 1.5" to 2"), making it compatible with most small to mid‑sized motorcycles, scooters, quads and off‑road machines that use similar diameters.

• Inlet range: 38mm–51mm for slip‑on connection.
• Overall length: 390mm to suit compact frames.
• Works on dirt bikes, street bikes, scooters, ATVs and quads.
• Sold with mounting hardware to simplify attachment.

How difficult is installation, and what tools do I need?

Installation is relatively straightforward for those comfortable with basic mechanical tasks. The unit slips onto the existing header or mid‑pipe and secures with included clamps and bolts; no detailed instruction manual is included, so follow standard exhaust fitting practices or consult a mechanic if unsure.

• Requires: standard sockets, wrenches, and possibly a torque wrench.
• Includes bolts and clamps as shown in product images.
• May need gasket or sealant depending on your bike’s setup.
• If in doubt, professional shop installation is recommended.

What materials and build details should I expect?

The Fast Pro muffler presents a hexagonal outer shape for modern styling and a compact 390mm profile for tighter clearance. While the product is sold as a universal accessory, attention to welds, mounting points and finish affects longevity and fit, so inspect your part on receipt and check mounting alignment before final tightening.

• Hexagon‑style outer body for a contemporary look and heat dispersion.
• 390mm length suits many street and off‑road frames.
• Universal slip‑on inlet adapts to 38–51mm headers.
• Supplied hardware for a complete installation package.

Who is this for: The Fast Pro universal inlet muffler is aimed at riders who want an affordable, easy‑to‑fit exhaust solution with broad compatibility. It’s a good choice for DIY enthusiasts refreshing a worn silencer, owners of scooters or ATVs needing a replacement, or riders styling a dirt or street bike without extensive custom fabrication. If your bike’s outlet size falls within 38–51mm and you can perform basic mechanical work (or have shop access), this slip‑on is a practical upgrade or spare part option.