Fast Pro Universal Slip-On Muffler 1.5–2" (38–51mm) for Scooters, ATVs & Dirt Bikes — 390mm Compact Bolt-On

Fast Pro's Universal 1.5–2" inlet hexagon slip-on exhaust is a versatile replacement muffler designed to fit 38–51mm exhaust outlets on scooters, ATVs, dirt bikes and street motorcycles.

This slip-on muffler offers a simple, bolt-on upgrade or replacement for riders who need a compact, durable exhaust solution without custom fabrication. Built to match a broad range of mid-size motorcycle and powersport exhaust diameters, it provides an easy way to restore functionality or change tone and appearance. The unit ships complete with visible mounting hardware and a 390mm overall length to suit many stock and aftermarket setups.

How does the Fast Pro slip-on mount to different pipe sizes?

The muffler uses a tapered hexagon inlet and includes adjustable clamping hardware to accommodate 38–51mm (1.5–2") outlet diameters. Installation is bolt-on where the inlet slides over the tailpipe and the clamp tightens for a secure fit.

• Connection diameter: 38mm–51mm (1.5–2").
• Supplied with mounting hardware for immediate fitment.
• Hexagon inlet shape helps prevent rotation once clamped.
• 390mm overall length for compact clearance on most bikes.

What performance and durability features does it include?

Designed as a universal replacement, the muffler balances corrosion resistance and weight for everyday riding. While not a race-only part, it offers a durable body and a construction suited to road and off-road use.

• Sturdy outer shell resists dents and abrasion in typical riding conditions.
• Universal fit eliminates the need for unique flanges or welds in many applications.
• Short 390mm profile reduces risk of scraping on trails and tight turns.
• Hardware included to minimize extra purchases at install time.

Will this muffler work on my bike and what do I need to check before buying?

It fits most bikes with outlet pipe diameters between 38mm and 51mm, including scooters, ATVs, dirt bikes, quads and many street motorcycles. Confirm your exhaust outlet diameter and clearance around the tailpipe before ordering.

• Measure the outer diameter of your existing tailpipe to ensure 38–51mm compatibility.
• Check available length and mounting points—390mm overall length may need clearance.
• Verify whether additional brackets or spacers are required for unique frames.
• Installation instructions are not included; basic mechanical skill and tools are needed.

Who is this for?

This Fast Pro universal hexagon slip-on muffler is aimed at riders and mechanics who want a low-cost, straightforward exhaust replacement or aesthetic upgrade for small to mid-size powersport machines. It's a practical choice for scooter owners, ATV and quad riders, dirt bike enthusiasts and street-bike hobbyists needing a compact, clamp-on solution compatible with 38–51mm tailpipes. Professionals and DIYers who can perform basic exhaust work will find it quick to fit and useful for restoring or changing an exhaust setup without welding or custom fabrication.