Doesn't really take much at all, especially with a 6 speed. There are two guys on here that are in the 12s with nothing but a lid and exhaust I think. They would be URFUCT and DinoZ. Of course, some Nittos on the back help a lot too. With a auto, all you probably need is a higher stall and traction if it's 2000 or newer. I'm sure one of the guys will post anything I may have missed or stated incorrectly.