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Ehhhh...that sucks then. I wouldn't put spacers on. The wheels/tires sticking out past the fender wells would look odd, IMHO.
Maybe an exhaust shop can move your pipes over a bit, if the hangers need to be cut/relocated that wouldn't be a problem for them. It should be a quick and easy job.
you could always put a butt load of heat wrap around the pipes where it is close to the tires; Just a suggestion. But I don't think there is gonna be much clearance with the 315's on any stang with aftermarket pipes.
I dont see why you cant loosen your catback and wiggle it away from the tires... BTW... im sure it wont hurt if its near the gas tank... (im assuming here... not posotive)