ok, so i cant just get a tuner and pull a couple degrees out of it? im guessing messing with the timing will through out the air fuel ratio?
how much boost are you making?
Only if you had the original tuner for that tune you can take a couple of degrees out of your car. And no taking a couple of degrees out will not affect your tune.
When you get a new tuner the car as to mate to it. Without the original tuner your car would have to get re-tuned.