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What he said has some truth. These tunes advance igntion timing and increase boost pressures. That equals a lot more heat generated. 87 will pre-ignite causing knock in those conditions. Tuners tell you 93oct recommended but 91 minimum for good reason. This is even more important in a tuned...

HP= torque × rpm ÷ 5252. Peak torque can be high but if it drops off like a rock higher in the rpms, your resulting hp will be low