First, I would suggest you take some time and dig through the forum. Everything you've asked has already been explained multiple times over.
Second, "the best sounding exhaust" is too subjective. Loud? Deep tones? Racy? Single exit? Dual? Again, it's all been discussed before, with sound bites.
Do your due diligence and come back with specific questions, and you'll get a lot more, specific, responses.
Or, go to one of the 370Z specific shops online and buy out their bolt-on catalog.
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