For intake def dont get a short ram. All short rams suck in air from where the exhaust manifold is. While the car is moving u might get some "cool air" but while idling u will just get hot air. I've heard of people experiencing bogging problems as well. I say get something that has a scoop that goes to where the fender well area is. Companies are like T1R, Mugen, M&M. They are all very expensinve, but if u want you could just use ur stock intake piping and just cut the resonator in half and its almost the exact same thing
If you really want to get a Intake Manifold, get the RRC hands down, Its from the CTR and makes great power, HMO sells them for about 370 i believe.
As for a header i would suggest skunk2 megapower. Great gains but cost around 700. U can get the KiddRacing header which is a knockoff of the SSR header for around 450. Assembly is a PITA but makes great power for what its worth. Also has a 2.5" collector which is a plus
Exhuast is pretty much up to you. Skunk2 70mm is loud as F*ck but makes power combined with everything above. I have the greddy SP2 with my RH and love the way it sounds. Not loud at all. Apexi ws2 or noir.