Frenchi934 Posted July 12, 2011 Report Share Posted July 12, 2011 I believe you are experiencing engine harmonics. My car has a new/replace just about everything and had almost exactly what you are describing, then when I put my new exhaust on it got better, but is still there. It was so bad it would just about rattle the interior apart with the gutted cat stock downpipe 1 Link to comment Share on other sites More sharing options...
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