I have rub marks on my tailpipes and i use the same tires as grover except the tire size is 275.
I really have no clue how people get 315's to fit with tailpipes. I'm going to be switching exhausts soon to one that i'm not going to weld together, so hopefully i can get a little more clearance. With a saleen kit there is no option to go pipeless, it will look ridiculous.