I have the Stillen HFC ( no rattling) and I just installed the Nismo Exhaust yesterday. The Nismo definitely has a deeper sound but barely noticeable. Things being relative, I find the extra note very pleasing and enjoyable. Itnis just the right "loudness."
you wouldn't believe how many exhaust/muffler I have bought and sold on my other non-Z car. At first, the rumble and loudness was awesome. After a few weeks, "sound of power" just becomes noise. The novelty just dies.
With the Nismo, I am definite it will be a keeper.
Good luck.
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