Better add an aftermarket exhaust to that list too. The stock Nismo exhaust is only good for about 7hp, more or less, where as most aftermarkets are good for 15-18hp over stock. That means by going with a different exhaust you are getting roughly another 10hp.
Lastly, most people with non-Nismo's who are running the list of mods you mentioned are running about 300-310 at the wheels. Honestly I don't see this being any different for the Nismo. All in all a CBE, HFC or test pipes, intake, and tune will net you about 30-40hp gain at the wheels but over a Nismo probably more like 20-30hp gain. Basically in the end, Nismo or regular 370z, you will have about 300-310 at the wheels.
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