terrencedwhite Posted May 3, 2011 Report Share Posted May 3, 2011 I would like to inprove my 03 sts performance is there anything i could do... Link to comment Share on other sites More sharing options...
Ranger Posted May 4, 2011 Report Share Posted May 4, 2011 Nope. GM did it all for you at the factory. There is very little left to do. You might gain a little by going to a larger exhaust, but the main restriction is the cross under pipe and there is no way around that. Link to comment Share on other sites More sharing options...
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