looking for any assistance in re-tuning a 2008 Trailblazer SS. cold air intake, cat back exhaust that's it. looking to firm up the shifts and if possible get it to shift a little quicker. Also, would like to let the motor spin a little more, say about 6,900 rpm or so. how would I calculate the shift speed then if I let the motor rev a little more? And would messing with the VE table and MAF do anything for a stock motor, or should I leave it alone?