Well this is going to show you exactly how much knowledge I have of motorcycle mechanics, which is not much at all. My previous bike was carburated and I had heard of folks getting after market pipes and air boxes thus requiring a stage 1 or 2 rejet. I have heard that the 2012 Victory cruisers come with a stage 2 kit out of the factory. What does this mean? I don't think my bikes performance and sound is drastically different than an 2011? I had done some "searching" but most of the conversations were between folks that know what they are talking about so not much explanation for the noob. Sorry for the ignorance.