I had the factory Nismo cat-back on my Z for a few years. I only paid $400 for it and it added a little more power and some growl, but not as much as the car should have. Which is why I upgraded to my FI system a few years ago.
Are you considering an intake as well, or are you stopping here because of the warranty? The right cold air intake combined with your exhaust will really allow the car to breath, which means more growl and HP.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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