No difference between stock Nismo and non-Nismo air intakes. As far as which aftermarket one is the best a lot of people like the Stillen G3's. Just be warned the when installing them on a Nismo there is some "light" modification that must be done to make them fit but nothing too significant.
For exhaust go with Fast Intentions. The wait might seem a little long but it's well worth it.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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