The OP brought up a common question about parts like Nismo.
Nissan like many other makes,does not directly make many of the parts that go into
a vehicle. There is no Nismo factory that I am aware of.
Per the Nismo exhaust system,it is made by a outside contractor. HKS is making
the 370 exhaust. Previously,Fujitsubo made the Nismo S-tune exhaust for the 350Z.
Same goes for intakes(AEM made the 350 Nismo Intake)etc.
I agree with the comment on adding HFC's .They will open up the sound a bit as well
as giving you a blip in power.
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