Quote:
Originally Posted by SkyDancer
Maybe because the Nismo engine isn't different from a non-Nismo 370Z's engine so the numbers for teh Nismo should be the same as teh non-Nismo 370Z?
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Correct, putting an exhaust on a Nismo will probably net equally to slightly smaller numbers because of the more aggressive tune a Nismo already has. Everything else about the cars are the same engine wise, minus the exhaust & tune.
Edit: To answer the main question, I think a lot of Nismo owners are first changing to HFC/RTP to open the exhaust up.