Need advice on basic exhaust system

IF you have a competent exhaust shop near you.....
I would get the summit header back 2 1/2 system for your body, and get a local muffler shop to bend up some headpipes to mate with the summit pipes.
High dollar solution: accurate exhaust or TTI.
Edit: tho I like the Flowmaster sound (some don't, and they do tend to drone) if I were you, I'd use the summit turbo knockoffs that come with the summit kit.