Originally Posted by Rusty

Ditch the Nismo sway bars and get a Hotchkis front bar. The Nismo coilovers are over dampened for the springs. A good set of coilovers like the Forture 500 and the correct springs will do wonders. Change the upper front control arms so that you can adjust the camber and caster. The SPL arms are the only way to go. As you don't have to remove the arms to make adjustments. Plus they hold the adjustment too.

Get your Z aligned with these spec's.
Front camber -2, caster +6, toe 1/16" in.
Rear camber -1.75, toe 1/16" in.
This will give you a good handling Z without eating up the tires.

Brakes. The 'bono's are a good caliper. Just need good pads, stainless lines and good brake fluid. Most use the Motul 600. I use Castol SRF fluid. It's $$$

You got the Z1 400HP package. To get the most out of it. You have to ditch the Nismo exhaust too. High flow cats, test pipes or LTH's are the way to go. Otherwise, you got a cork in the exhaust.