muffler guts
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i have heard that by drill out the guts in a muffler you get more HP. is that true becuase i have also heard that there is a certain amount of back pressure needed to run good. i have removed the end cap and looking into the pipe i can see some holes that the ex runs through, are those the guts i should drill out ? its for my sons 110 mojave project im working on..
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