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I picked up a used stock muffler for my 02 MXZ 600, so i can swap out the Sno-Stuff can thats on it, when we go to northern wisconsin Anyways, the PO punched 2 small holes next to the seam, 1 at the top of the muffler, 1 at the front just over the bend. My question is, why would anyone do that? Make it cackle? And will it hurt anything or cause any motor damage running it this way, or should i weld the holes closed?
 
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