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8-10 psi is gonna do a lot, especially with a high compression ratio, don't know much about honda's, but a well tuned impreza 2.5rs will go from 121 whp ~125 ftlb to 195 whp 235 ftlb running 10 psi with a 10:1 compression ratio
but i agree that doing it with an older motor isn't a good idea as well
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