Does the stock Nismo exhaust system look like this? If so . . here is my experience improving the exhaust sound from stock.
I bought this Nismo exhaust from a member of this forum and then added Berk high flow cats. The high flow cats made the exhaust louder with a deeper rumble at idle. From my experience with these mods. (and I know this is not Rocket science engineering) . . . the best changes from stock are changes that create a freer flowing intake system through exhaust system. (1) Stillen Gen. 3 intakes, (2) high flow cats and (3) less restriction in the exhaust made a big difference from stock on my Z.
So your stock Nismo exhaust system might be fine. Just add better intakes and high flow cats. to have a better sounding exhaust. These changes need to be made anyway to improve your performance. If the sound is still not what you want then a new exhaust system is the next step.
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