^
So now that i have rims, I'm trying to decide what is next for upgrades. Im thinking either cat back exhaust from borla or a plenum spacer/replacement. i already have a nismo CAI and i want to unlock some horsepower. Would a plenum be the next best step?

 

I would recommend a two part combo - Kinetix cats and their Racing V+ plenum. I'm putting them on my car shortly, when I receive the intake. Kinetix (http://www.kinetixracing.com/index.asp) has a special currently for $699.00 USD for both. I called and spoke to rep from Kinetix and he told me that their new intake plenum plus the cats are good for an extra 20+ rwhp.