well i went to the track after thinking my tunes off and the gears didnt help . i have a 06 gt auto , c&l intake, sct2 tune , mac axle back and 4.10s . my best of the day was a 12.9 at 106 , i was amazed at the times , my 1st pass was a 13.002 at 105.92 i was thinking 13.3s or worse . i was wrong. my 60fts were best .1.94 and worst a 2.1 ..on the stock 17s wheels and tires