Just a quick note (lots of variables) - I've got a slight rear rub happening (on moderate suspension load - e.g. bumps, driveway entry), non-sport pkg, 245/35/19, et35, WITH a 15mm spacer, Falken 452 (which are pretty square).
Might have to roll the fenders...or get a smaller spacer. Depends on whether the rub is at the fender or inside at the wheel well. Not sure yet.