Driver mod is great, but for the Z there are a few things I would personally do no matter what:
Brake pads
Brake fluid
Oil cooler
This is if you're going to do road courses (track days).
For autocross you can get away with being 100% stock.
The next mods just depend on your skill level. Throwing parts on the car won't do much if your skill level can't take advantage of them.
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