Here is Seb@SpecialtyZ's 370Z at up to 12 PSI. Look at the torque band...

http://www.the370z.com/758798-post26.html

I've honestly not seen anyone with anything higher than Stage 3, unless you are talking about Bullitt's car which is aiming for 1000 whp. There's the G37 making over 600 whp with over 12 PSI.

The SpeciatlyZ's 370z, is tat stage 2 or stage 3? On stock internals?

Stage 2 I believe

great choice,

i would recommend the following:

GTM STG 2
GTM fuel system
Twin pump
Built engine if you planning to track 600+hp
GTM competition Oil Cooler
HKS EVC 6
Koyo radiator
Samco hoses
Sam@GTM magic tuning

Good suspension setup is a must as well.
and good brake pads.

IMO, anything above 500 mark on the track will be nasty, you will be worried to lose the car more than getting worried to get out of the turn on the right speed...

the turbo's on stage 2 are abit laggy, but when they kick in they kick like a mofo..

That's what I hate about turbos is the lag when your on a tight course. NA cars will run from you.