holy quadrupal post batman lol
Yea dont worry about the header, your not gonna gain much from it, and the money is better spent on parts for your turbo set up.
Honestly though, i think your first order of buisness is going to do alot of reading. Homemadeturbo.com has a great FAQ section, and some nice intro to turbo write ups. You REALLY need to know about turbo set ups before you install one, because just haveing the turbo is one thing, you have to understand what ITS doing so you can understand what the CAR is doing and make sure there both doing there indiviudual jobs both properly and efficiently. So yea, get to reading, thats step one to "ricer to racer 101"