The 2013 XM,s that I have seen on the snow and at jackson didnt have the new mounting location for the skid, the holes for the rear skid bracket
were punched and plugged in front of the 2012 design, all the 2013 XM,s
had the rear drop bracket in the 2012 location, also didnt they move the ski to spindle mount back 7 mm and not forward, SLP spindle moves this point back 14 mm I believe, I could be wrong on that but that is what I was told.
Also what would happen to a 2012 summit if you put the 2012 freeride front upper A frame on that would allow the bars to be moved 2" forward?
There seem to be small refinements to the 2013 xm that would enhance the 2012 xp ride/feel of how the xp chassis would handle.
sometimes small changes improve how a sled performs and that is what i
believe they did with the XM chassis