That 1 PSI for 10 HP may be a good rule of thumb for guesstimates - but after I added my bigger injectors, BHAF and 4 inch exhaust, I got LOTS more HP, and only picked up 2 PSI boost max. I think that after a certain point, efficiency, timing and other operation parameters can offset or slew guesstimates based upon PSI boost alone...
Either that, or I was LOW on power before I made the later mods - but I *did* dyno 311 HP and 827 TQ before the mods...
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White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.