My Speedmaster is a 04 model. You can see the Dyno runs here:
http://www.twowheelsgood.net/speedmaster/speedy.html

Checking their website they only show a 13% increase with the Short Sport mufflers so I'm not disappointed with the 10% increase I got. My peake numbers are pretty close to theirs but my speedy started off stronger stock than any others I've seen dyno numbers for.

Hugh

www.twowheelsgood.net