more HP
 

I'm looking at Injen (for the NISMO) CAI and some high-flow cats or test pipes. After that a tune, if I can hind someone here in North FL. anyone running something like this? what were your gains??? Would love to see an extra 35-40 at the rear. Any thoughts?

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.