Very nice video....
but being the jerk that I am, I'd like to point out a couple reasons why this isn't a fair comparison.
1- the 550XPG used loses a little bit of power through the magneto to power the hand warmers, regardless of if they are running or not. Just a function of the force required to overcome the magnets on the flywheel interacting with the generator. The 550XP mark II did not have the G handles as far as I could tell.
2- the bar / chain was different, although I assume they were both new bars and off-the-roll chain, one can't be certain.
3- the operators were different. A man vs a woman, who knows if one is pushing harder.
Still, if Husqvarna has managed to wring another 4-7% of power/torque out of that engine in stock form, and achieve 30% faster rev, that is pretty cool. Could just be they have a slightly more open muffler, but maybe they used more tricks? Does it also mean they are leaving less "on the table" for porting to gain, or does it mean a ported mark II will be faster than a ported mark I?