I agree with classic on the wheel thing, not to mention you really start to sacrifice comfort with tire choices on the larger wheels, especially when lowering your car. I've got some Rota slipstreams for the street, 16x7 with 205/45/16, and that's about as low pro as I'd go, especially since I've got a set of 15" wheels for track use and 13" whenever I've got an off road event.