Well I've got a fairly big car, its only a two seat but still big. I have 600+hp and an s4... what size dirt tires should i run? 33, 35, or 37? I'm afraid 33's will look too small but whats everyone else run? Thanks

All looks aside, what was the trans geared for? That will make the most difference. You do not want to wind out the trans too soon in each gear.

Well the care came with stu 35.5s if that helps

run 35's in the rear.if you have 2" hollows and stout uprights,then run 35's in the front also.

I would do 35's. Maybe 37's if it's geared right, but that is a lot of weight compared to sand tires.