I hear the % increase thought, but IDK where you got 390rwhp. Bone stock 550s put down around 340whp, which is pretty healthy given BMW's 400hp claim. AA already released software for it, and got a 37whp/44wtq delta. Considering that this software probably has left power on the table (think about where the N54 was when it was first released), I'm sure we can expect more, even though the very sharp fall off in power is a bit disconcerting when you think about it's potential...but as of right now, 340ish is what they start with, and 380ish seems to be the peak.