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Had mine tuned locally by a GM certified machanic (own his own time). I can tell you by-passing the D.O.D. and changing shift points we were able to make some drastic changes. I know I'm gonna get flamed by the "you void your warranty" crowd but it doesn't really matter, since I am installing a Kook's exhaust system here soon. That and ported the throttle body should pick up 50+ hp additional.
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