I found this to be a really useful thread. I tried to get 17" Kappa's thrown into the deal on my new ZR, but they'd already bent over backwards on the price. Thanks to the advise of this thread, I think I'll drive around on the standards for a while, then look around for some sexier wheels later. I had no idea you could get 18s to fit! What do the larger wheels do to handling and fuel economy? Would it affect the new car warranty?