GREAT question, one I am hoping you could answer because once upon a time when mine went from 17" back to 13" (insurance matter etc.etc.etc.) the car was dramatically lower ... no idea why. I know mine sits slightly higher on my street rims then my track rims because the street rims have 215/45r17 tyres where as the track rims have 205/50r16 so the rolling diameter is slightly larger (about 3% I think) Lightweight rims and lowered springs (in that order of course) + some konis and camber pins will keep you happy for a whileAh we are getting somewhere .. that's a great set-up, I sometimes wish I had gone that way instead the noisy coilover route...