I would not worry about the head change thingy. If the bike runs out good then get it. I have a 2004 R1150RT now and used to own a 2002 R1150RT in the past. They all run rough but they run good. The 1150 engine just did not hit the mark for a smooth BMW engine. My 84 R100RS and my 07 R1200GS are both much smoother. But saying that I still love the 1150's. Like any beemer it seems the harder you ride them the happier they are.