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It could possibly help AND hurt. It might help in the performance department because of a more aggressive fuel curve, but the 7800 rpm rev limit on the integra (PG7) ECU is most likely higher than your HF engine was built for, considering the HF rev limit is about 5400rpm or so. If you were to use the PG7 ECU, you might want to think about shaving some lead off your foot becaue too many times of revving it past 5800rpm or so and you can say bye bye to your engine.
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