I got a couple of questions for the build I want. First off, what are my choices for a tune, I have seen uprev. what are some mods that can be done before I get a re-tune or can I get a tune prior to any mods. I only have an intake that was installed by the previous owner. But I am going to do headers back eventually, among others obviously.
Has anyone done F/I on one of these cars? I'm considering on keeping it N/A or leaning towards a Stillen super charger. I want driveablity and reliability over max horsepower.
Any knowledge about things I need to do prior or if there is a specific order I need things done is most appreciated.

There are plenty of FI G's running around. Fezzik here has a GTM SC'd G37 'vert. http://www.infinitig37.com/G37-converti ... stall.html

With bolt-on's and a proper tune I've seen some get appx 330whp. Most don't go with headers because they don't offer much from a hp perspective and are knuckle busters to install.

Yes after I wrote this up. I found a thread of an S with 313 whp. After a tune. Had the same set up I'm looking for too. I will probably get to that point and re learn the cars new quirks. And go from there.
I do have a question for you though Aud. I have really only seen Osiris by UpRev for a management/tune. You have a Cobb? Been to the website and only see one for a GTR? Thanks for all the info you have been given me.

Cobb no longer sells N/A tuners; they stopped selling them a couple months after I bought mine. UpRev seems to be the way to go.