if you had 5,000$ to spend on modifying a z what would u spend it on without going FI, or nitrous.
i have stock suspension/brakes, and a base model Z mods are in my sig.

 

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kinda hard to say since you didn't say what your goal is for you Z or what type of racing/performance driving you do. I think most guys on here would tell you to go FI if you've got 5k to spend but if thats not an option I might look at:

aam or motordyne spacer
nismo or stock lsd
technosqure reflash (I don't know what unichip does for you)