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hey guys i got a 2003 gt with a vortech sq2 but it had the basic set up not much power, i added a precision intercooler, holley fuel pump, new plugs , trick flow manifold and a 75mm throttle body, i also have complete magnaflowexhaust no cats, will a new custom tune make a big difference, the guys whos helping me build the car told me not to step on it until i get the new tune, does that sounds right to you guys.
are you at least running the tune from vortech(not a good tune) but... its better than no tune for now. if your not running that i wouldn't even drive her yet.