Intake isn't going to gain you much right now. It would be more of a supporting mod (IMHO). A cam, headers, torque convertor, or even an electric fan setup would all net you more individually or together.
I am personally swapping my cam first (along with a torque convertor built to the cam's specs) and then may very well drop a turbo on it. Coming from an F-body, I can vouch that the 5.3 can take boost pretty well as we have actually swapped them for the 5.7s.
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