they will fit i have 315/35/17's and i also have the american thunder 2 1/2 cat back system here ya go:
i know i know sorry for the ugly tips i got the 3 1/2 ones i need to put on, and when these tire's burn off i'm going to go with 335/35/17's BTW the current tires here are goodyear GSD3's they are the widest 315 on the market! they measure from side wall to side wall with a tape measure 13.2" or 15" peace