Originally Posted by PencilGeek
What I'm trying to say is that it may only be midrange HP increases on a dyno, and not in real life. If they're playing games with the fuel mapping to fake out the fact that the motor isn't getting proper ventilation -- then the increase in power will only occur when the motor is not getting proper ventilation. In other words, you'll never see any increase while you're driving -- only on the dyno.
Got it, clear enough!! Which is why I think we should stick with reputable tuners always!!