The previous FZ1 made around 120-125 at the wheel, so I'd say 130 or so from the new one. That's about 20 up from my Bandit, so I'm sure keeping the front down on an upright bike is a constant task. Here's a dyno chart with jetting and a slipon and then with a header:
http://holeshot.com/dynocharts/dyno_fz1_header.html
That S3 is a heck of a bike, too. I've been drooling all over the recent CW review on it.