Right. Well mine is a R6 Raven and it's a 2006. It produces around 112~ bhp on the dyno. Is this correct? I thought it was meant to be 120+?From what I have found, 2CO is the parts model for the 06/07 bikes. In 08, it changed over to 13S for the parts diagram.
R6r is just a slang term used to describe 3rd gen bikes(06 and newer). Technically, the only R6R is the 2003 model, as the letter R was the suffix for the model year, but that is something no one really pays any attention to. Generally speaking, if the part says it is for the R6r, you can be pretty sure they actually meant the 06+ bikes.
Based on all that, if the part is for a 3rd gen, it should fit(with the exception of a few parts).
As for the most brake horsepower, they are all right together. I believe the 08+ actually makes a tiny bit more peak horsepower as well as have a stronger midrange.