Karl, sounds like a pretty serious Z3 :) As far as track tires go, there will be no better fittment for you if you are going t drive the toires to the track. The A032's have the ability to do a fair amount of street use without damage which is unique. My favorite tire for you if you were not going to use it on the street would be the 225/45/17 Hoosier R3s03. The R3s03 is a bit sticker and the carcass is a few lbs lighter as well, but you will ruin them on the street (and they pick up everything in sight). If you wish to chat, or need to place an order.....let me know. thanks Aaron 800.428.8355 x395