Dunno about the '06 in relation to older models. As far as I know they're rated the same. I did read on FA(i think) that Nissan has said the '07 model will now be 306 or 307hp up from the 300hp it's at right now. They touched on that they have also changed the way they factor drivetrain loss so people are saying that it will really feel/be more like a 15-20hp gain.