Nismo exhaust is only good for ~7hp over stock Z. The majority of the power comes from the tune. There isn't much difference between the stock exhaust and the Nismo. One week after I got my Nismo and swapped it out for my previous Z's FI 18' resonator with carbon fiber mufflers. There was a good noticeable gain on the butt dyno, not to mention a difference in sound and much lighter in weight. For me the Nismo was not much better than stock in the sound department. For a stock Z the Nismo exhaust is a good upgrade for those looking to not spend that much money but personally i think it's worth the extra money to go with aftermarket. My Nismo exhaust is just sitting in my garage for now.
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