I would guess around 328HP...removign the restrictor would put it up to 11psi (gaining 18HP) and the test pipe (if you gutted the pre cats and got an intake) would be good for maybe 10HP. Just an approximation.
If you are running 14psi (which would mean some sort of boost controller/bleeder not a removed restrictor) you could add another 27HP to that figure.
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