just put the sprockets on and can notice a definite increase in acceleration and lower down power. put my speedo out by 16% though( including factory inaccuracies) but put in a speedo healer the same day and now its spot on. installing the power commander and two bros cans this weekend. will use a downloadable map for the pc until i get my k+n filter and do the airbox mod, then i'm taking it for a dynotune. Can't wait to see how it goes then.