get (your profile says you haven't done this yet).... As far as turbos go, avoid trying to get "cheap" ones, or cheap rebuilds, you will hate yourself in the morning. A decent rebuild costs a lot (see Z1's site for some comparisons) You can get JWT Sport 500's for maybe $600 more. I like them because they offer up to 500 hp with almost no power loss at lower rpm. If you look at dynos of the 600 hp turbos, they have a lot less power at 3000 rpm, for example. You will need bigger injectors for any turbo upgrade, another expensive mod.