Muffler Insert, for 4 Pipe Exhaust, 2-3/8 OD 10-5/8 Long

OVERVIEW

When you are tearing up the dunes or cruising the local strip in your air-cooled classic, the sound of your engine says everything about your build. The BUGPACK Muffler Insert for 4-pipe exhaust systems is the professional choice for enthusiasts looking to maintain that signature VW growl while ensuring optimal backpressure for engine longevity. Designed specifically as a high-quality replacement for the baffles found in the iconic quad-tip exhaust systems (such as part number 18-1047-0), this insert restores the acoustic balance of your vehicle. Over time, original inserts can burn out, rattle, or become clogged with carbon deposits, leading to a loss in performance and an unrefined exhaust note. By upgrading to this genuine BUGPACK component, you are ensuring that your engine breathes correctly, protecting your valves and maintaining the low-end torque that air-cooled flat-fours are famous for.

Crafted from heavy-duty materials, this 10-5/8 inch long muffler insert is built to withstand the extreme heat cycles inherent in high-performance Volkswagen engines. Whether you are running a stock 1600cc dual-port or a high-revving stroker motor, the 2-3/8 inch outer diameter provides a precise friction fit that minimizes vibration and exhaust leaks. At Appletree Automotive, we know that off-road environments like sand dunes and wooded trails are unforgiving on exhaust components. That is why we recommend this BUGPACK insert for its robust perforated core design, which provides excellent sound dampening without creating excessive restriction. It is the perfect blend of form and function for any Baja Bug, Sand Rail, or Manx-style buggy that utilizes a 4-pipe "glass pack" style header system. Don''t settle for a loud, raspy exhaust when you can have the tuned, powerful tone that only a fresh BUGPACK insert can provide.

FITMENT

• VW Beetle (Type 1): All years equipped with a 4-pipe "Quad" exhaust system.
• VW Karmann Ghia: All years utilizing custom 4-pipe header setups.
• VW Bus (Type 2): 1950-1971 models with modified off-road or custom street 4-pipe exhausts.
• VW Thing (Type 181): All years using the 18-1047-0 style exhaust system.
• Sand Rails & Dune Buggies: Universal fitment for any custom rail using 2-3/8 inch ID exhaust tubing.
• Compatible Exhaust Systems: Specifically designed for part number 18-1047-0 and similar BUGPACK quad-tip headers.

SPECS

• Manufacturer: BUGPACK
• Part Number: B253900
• Outer Diameter (OD): 2-3/8 Inches (60.3mm)
• Total Length: 10-5/8 Inches
• Construction Material: Heavy-duty perforated steel core.
• Finish: Raw/Natural steel (Ready for high-temp paint or ceramic coating).
• Design: Straight-through perforated baffle for maximum flow with sound reduction.
• Quantity: Sold individually (Each).
• Weight: Approximately 1.08 lbs.

PRO TIPS

1. Secure the Insert for the Long Haul

One of the most common mistakes we see at Appletree is failing to properly secure the muffler insert. While the 2-3/8 inch diameter provides a snug fit, the vibration of an air-cooled engine combined with high exhaust pressure can eventually cause the insert to "spit out" of the pipe. We highly recommend drilling a small pilot hole through the exhaust tip and the insert flange, then securing it with a stainless steel self-tapping screw or a small nut and bolt. This ensures that your investment stays inside the pipe where it belongs, even during high-RPM runs or rough off-road sections.

2. Tuning Your Exhaust Note

If you find that your 4-pipe exhaust is still a bit too loud for your neighborhood or local noise ordinances, you can "tune" these inserts. Many veteran builders wrap the perforated section of the BUGPACK insert with high-quality ceramic muffler packing or stainless steel wool before sliding it into the pipe. This will significantly mellow out the higher-pitched "crack" of the exhaust note and provide a deeper, more mellow thumping sound. Just be sure not to wrap it too tightly, as you still want the exhaust gases to be able to flow through the center core for performance.

3. Prevent Seizing with Anti-Seize

Exhaust components are subject to extreme heat and moisture, which often leads to rusted-in baffles that are impossible to remove later. Before you slide your new BUGPACK insert into the header pipe, apply a thin layer of high-temperature copper anti-seize to the outer edges of the insert where it contacts the inner wall of the exhaust pipe. This small step will make it infinitely easier to remove the insert in the future if you ever need to clean it, repacking it, or replace it after a season of hard riding. It also helps create a better seal to prevent "exhaust soot" from leaking around the edges of the baffle.