08svt Posted March 10, 2012 Report Share Posted March 10, 2012 How restrictive are the stock GT500 mufflers compared to aftermarket. I have 08 GT500 with LT Kooks headers with catted x-pipe. I have gone through a couple of sets of different mufflers and wondering if I go back to stock how much am I loosing? Quote Link to comment Share on other sites More sharing options...
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