How to modify a set of stock mufflers to flow like GT500's. Picture shows dual outlet GT500 muffler but from what I'm told the single out version is the same with one less outlet. I have a sound clip after the mod (I should have done a before and after but didn't think about it until it was finished but I'm sure you can find some stock exhaust videos). http://www.youtube.com/watch?v=SudepXqRWd0
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