[LightningGSX]

Really, theres a few very minor things that can give you big problems, but they're simple to overcome, and like Ryan said, the most that will happen is your car won't start.Of course you can enter bonehead values in your fuel/timing maps, but its the same with any other tuning device.So if you can't figure this stuff out after a few tries, you have no business doing anything to your car, other than driving it.