and go for the GTX line. What kind of boost could I run with 93 on a set of GTX2867R's? Realistically I'll probably almost never run any 110+ oct, so whatever I can get on the street, will be the most important factor. Z1 claims 600+ hp for the GTX2867R on 18psi. Is that at the crank or at the wheels? I assume on 93 I'd have to run over 20psi to reach 500rwhp. Would that max out Nismo 740's?