I'm thinking of running in DSP, and I'm curious to know what options I have for wheels. Will 15" wheels fit, or is 16" as small as I can go? The front rotors on the new Si are 11.8" (+ caliper obviously), so I think 15" wheels might fit, but it would be tight. Any help would be much appreciated. I'm having the damnedest time finding out if the 15s will fit.