already have cold air intake, 3" straight exhaust with shorty headers, hypertech programmer, 85mm throttle body, 1" tb spacer, msd coils and wires, ngk plugs, hi-flo GM fuel pump and filter, and underdrive pulleys. I wanna see what the weakest part of my Z is. So far the drivers side front axle is the only part that has given me probs but thats solved now. O and its got 200k miles on it. Its pushin 400 hp but 650 would b beautiful!!!!!!!!!