Originally Posted by Raeshlavik

Depends on the model of your Z, what options it has, and how you define 'performance'...

Base models gets different first mods than sports and nismos because each uptick in trim level includes the things you'd be buying anyway. For example, on a base Z you probably want to look at a LSD - but the Nismo comes with one so no real need unless your pockets are deep enough for a mechanical to replace the viscous.

Then there's the AT/Manual question as that effects the gearing... And there's different schools of thought for track performance, straight-line racing, and drifting...

So - tell us more about what you have and what you ultimately want it to do.