With a turbo, you shouldn't need that much boost to make 450, let alone 425 hp. Right now it is just a waste of fuel and not good for the plugs, O2 sensors, etc... to run it that rich. Might as well drop the boost a couple pounds, lean it out and make more power.@ 9 psi? I think 450 is reasonable with a decent tune on 9 psi.
For example, my car made 63 more HP with 1 less lb of boost. The current tune is likely not a good one.
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