Originally Posted by chrischhorn

if power is not your main goal but tracking is, i personally would upgrade suspension, brakes, brake ducts, oil cooler, diff cooler, wider wheels and tires, new diff, sway bars, etc. And see how much more power you need after that. Make the mods to put the power down before you add the power to see how you like the balance of the car first. If you go fi without the supporting mods first, you're going to hate the z as a track car. The car has enough traction problems as is. The vlsd will heat pretty quickly and turn into basically an open diff.