and that is at moderate boost, about 14-15 PSI. You can get the 2835's (I think MikeH got these bad boys to fit) which will easily put out 600 at the wheels. ZHounds has the TD05 16G kit if you want details on it. If you want HUGE insane power you can try and wedge the GT3037's in there that are capable of 470 HP each, but there is no kit made for the Z and they'd be pretty tough to get to fit. The largest GT kit made that I know of is the GT2530's which I chose over the TD05's because of lag.