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Your car is probably running way richer after the rewire, which would explain why it runs good at 20psi but not at 12. (A wideband would be really helpful here.) It doesn't sound like a boost leak if it "hits over 20psi quickly," but it never hurts to double check. I recently rewired my fuel pump and was surprised at how much of a difference it made; about 28% more fuel at WOT.
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