If you do this along with removing the airbox lid, removing the"pea shooter" out of the silencer, and re-jetting you should see a sizable increase in power over the whole power band. Most of us have done this mod, and like it. I would recommend it.
My local dealer did the cam mod for me (along with Sparks full exhaust). At the moment, I've only ridden it once for 2 minutes, and it ran great, but I never rode it "stock" so I can't offer a comparision.