G13b definitely comes alive with boost. I'm at 3500ft ASL in Calgary, so that tends to kill NA performance as well.
I remember seeing that Motor Trend article before. It's a great article, especially the slalom times. I do question how 'easy' they were taking it on the car or what kind of tires they had on the stock setup to sandbag the stock braking distance and 1/4mile times so bad. Even my low 16 second NA times were never that good compared to what a lot of the other guys seem to run
RedlineGTi.com - Quarter Mile Times