Just picked up a hypertech power programmer 3 off ebay for my 97 Camaro SS. They've been discontinued for some time due to an EPA issue in California from what I've read. Mainly getting it to correct speedo for 3.73 gears and also lower cooling fan speeds for a 160 t stat swap. Also will bump up the rev limit from 5800 to 6300 once I do the 1.6 roller rockers. Question that I have is if the power programming canned tune is worth loading. I know that when I ran a canned 93 octane tune off a Diablosport Predator for my old SRT4 it ran dangerously lean. How do these tunes make power? Do they just randomly lean out the fueling and make it feel more powerful off the line with losses at higher rpm? I figure as long as a I run 91 octane fuel and listen for knock I should be ok to at least try out the tune. Thoughts?