4" inch diesel straight through performance exhaust mufflers constructed with 409 stainless steel, our race exhaust mufflers designed to allow for maximum free flow—and horsepower. Whether you have a true dual exhaust system or not, our mufflers will make you master the flow & the sound of your exhaust system giving you the max dyno results. Our bullet race exhaust mufflers, resonators and glasspacks & can be a great addition to your on road super custom project. mufflers feature a straight through, perforated 409 stainless steel core wrapped with stainless steel mesh acoustic material, making it the ideal mufflers for your next custom exhaust project, allowing for a free flow through the pipe with very little restriction.

• Made from Heavy Gauge 409 stainless steel.

• Free flow muffler, straight through perforated stainless steel core wrapped with stainless steel mesh to enhances sound, exhaust flow & improves performance.

• Minimal decibel reduction over open headers for deeper & more Aggressive Sound.

• Perfect for any custom exhaust project or muffler upgrade.

• Fully Welded Case.

• Universal Fitment Compact size muffler - will fit anywhere.

*ID = Inner Diameter
**OD = Outer Diameter