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Your set up is almost identical to mine. Only difference is my car has stock heads and TB. It made 484 whp on a mild spring day. As others have mentioned, so many different variables that effect the numbers. Maybe they all lined up in the worst way possible that day. You could try a tune on a different day, dyno, tuner, etc. and you'd probably get a better number. Or you could ignore the number on paper and just enjoy the car. Not being snarky. I'm sure the car is still a beast.
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