One of my sources tell me this might be getting 500hp-550hp. but it feels like something more like 450-470hp. if you see it this way, RS4 has 420hp, New S8 with the same engine as the this has 450hp. alot of things points at 450hp. Gee, i wonder how much grunt the new RS6 will have when it shows. the earlier model S6 had a V8 @ 340hp, same as S4, & RS6 450hp, difference of 110hp, Really hope the new RS6 gets a bigger V10 @ 530+hp. Well it's just thoughts but it may become reality if we're lucky ;-D.