A friend of mine has 305/35 on a set of 18" TSW Thrust. He has a 03 Mach 1 w/ Steeda springs.(about 1.5"-1.75" drop) The fender is cutting his tires up BAD. He has only put a couple thousand miles on them and they have some seriously deep cuts in them. Sorry, I can't remember what brand(I think BFG GForce KD), but I'll try to find out, and let you know.
Dan