Monster Nismo
 

I am getting a 2015 nismo in 2 weeks or less time and I am planning to make a monster over the winter break. So far on my mod list is armytrix exhaust (read bad reviews about this cause of shipping but dealer lives 5 mins away from me) stillen 3g cai. I was wondering what the best headers would be, along with any good intake manifolds as I have read about couple of them on the forums. If theres any other performance parts out I would love to know! of course a tune will come after everything is put on

Monster Nismo
 

FI long tube headers and your choice of the z1 or motordyne manifolds. That and a tune combined with the cai and cat back and you'll be somewhere around 330ish whp on a dynojet.

Throw an oil cooler onto the mod list. Also, have a fund set aside for when the csc fails. It will fail. Bonus points if the emergency fund includes enough to throw in a nice clutch and flywheel when the tranny is out to install the aftermarket csc.

And that's about all you'll be able to get out of it staying naturally aspirated. After that, it starts to get really expensive.