The end can will help it rev a bit more freely, but the arrow colecter pipes and power comander make the most difference in gains, and as said it is around 100bhp, the torque curve is improved a lot, from down low right through the rev range, but adds to the noise.
I'm running a k&n filter air box mods, and a fuel end can on arrow collecter pipes, with pc v, and an xtre,with a dyno calibrated fuel map, the difference in performance is very good, but it is a little noisy, I'm looking to fabricate a decibel reducing tip for the end can, as the one that comes with it is just too small a diameter to give what I want.
It is no sports bike, but is better out of the corners on modern rough roads, and they get down the straights rather well too.