I know most people will say a gear is the best bang for the buck upgrade but is that jsut because theyre coming from the 2.73(?) gear? i have 3.27's(?) in my convertible gt. Is it worth it to go to a 3.73 3.90 gear? I plan on doing around 75-100 shot ovr the summer for maybe monthly track use but mostly for streetuse as my DD. How much of a performance difference will i feel going to a 3.73 or 3.90? Worth it? Its probobly the one thing i couldnt do myself so i imagine itd cost like 500 or so.