From what I gathered looking around for myself on superchargers there are quite a few for the ls3 vette. Most are making around the 600hp marker to the tires with just the FI and no other mods. So with a cam for FI and a few other add ons you could see around the 700hp marker with no problems. Also GTA most of the kits designed for the ls3 are around 6psi so you were right on the money with your guess.
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