I don't doubt the Power Kit makes a diff. But I'd REALLY love to see a dyno of just the fuel controller on a stock pipe. Same bike, same day, same dyno. Back to back please! I'd hazard a guess that most of the power gains are the result of the controller only.
I'm just jaded on pipes. Had them on a few bikes, but other than sounding louder, my butt dyno says no gain. Hell, at least one of them actually hurt performance. One bike I had I got pulled over for pipes (street bike) so I put the stocker back on and left the power commander where it was. No diff!