Stage II has a MUCH more linear power band than stage I (less in your face torque). Much more driveable as a daily driver and a bit more power up top. Sounds the way it should have from the factory though cold starts are obnoxious, haha. Pulls like a train 1-6 now instead of 1-3 with stage I. Not a huge increase in power but feels much better. BEst way to describe is it feels more like stock, but more power everywhere. You will enjoy it. Then you will want K04 after a few months, haha.
Search the forum for stage II impressions/reviews. People will eat you alive here if not.