Umm... they kinda DID.
Very conservatively.
@OP, the tune is like night and day. The actual hp/tq numbers aren't that different most of the time, but the throttle response is way better, the car feels much smoother, plus you get the maps so nobody can steal your car at night and take it for a joyride. You can also get way better mileage, I've heard stories of 30mpg and up, if you're into that kind of thing.
