drakon543
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- Feb 15, 2016
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alot of aftermarket mufflers dont have this feature as alot of them are straight through or fully hollow with sound chambers. oem mufflers use a padding material around the internal pipes to dampen the sound or something like that.I honestly never heard of a drain hole in a muffler. I guess you’re never too old to learn. None of the aftermarket ones I’ve bought had one afaik.