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Powercore 4 to stock muffler

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I just purchased a 2003 xr100 for my son. It came with a fmf powercore 4 muffler. It is too loud for my neighbors. If I switched to a stock muffler, how much more quiet would it be?

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Stock muffler is about $80 on eBay. You can probably sell the aftermarket muffler for more than you pay for the stocker.

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