im not sure of any ZTT's running 500hp, but i would think there would be good reason to run a different crank at that sort of power... i wil ask a few questions and get back to you as i know a chap running one at 10k with over 350hp... see what he says.. if you want a cheap fun car then i would keep the std crank and do the rest of your mods.... get it on an engine dyno and run it hard....