Seller notes

20421S Straight Through Universal Slotted Ends Exhaust Muffler - 4 Inch ID, TOTALFLOW 4" inch diesel high performance straight through performance Diesel Slotted Ends exhaust mufflers constructed with 409 stainless steel, our universal 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 universal muffler repl...

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