i have been doing scca solo races with my 07 si w/ the OE all seasons (eek) for a couple of months now. i feel like the stock tires are holding the car back from reaching its true limit. i was originally looking for a dedicated set of slicks to mount on 16" wheels, but i think it would be more economically feasible to just get a set of max performance summer tires on my stock 17" wheels. any suggestions? i was thinking about the kumho ecsta mx. i have heard mixed things about the tire, but for the price they seem really good. also, should i go with a slightly wider size?