Yep...it does on hard acceleration, under load and around 3,500 rpms, but you can find a sweet spot. Also, at cruising speed, 70 to 80 miles an hour it's no different than with the muffler. I'm thinking about a resonated y pipe or AAM resonated H and mid pipe which are under consideration. My thought is if I decide to do something different I can, including putting the muffler back on and sale the straight pipes and not be out much money at all. The pipes are @ $450.
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