A few things that I noticed:
It has what appears to be a factory installed 121" track. The track looks like an OEM Kawasaki track, the rail extensions were a stamped steel and were riveted in place, and the tunnel extension also appeared to be factory installed with stamped and riveted parts.
The tunnel decals looked like standard 82 decals with large silver and red decals on top of them. These covered up the 82 decal red and silver pin stripes, except for one spot where the silver decal was pealed back where you could clearly see the red 82 pinstripe. All decals looked to be installed at the factory as the tunnel rivets were over top of all decals.
The back and middle bogie wheels are different, they looked like lightweight Kawasaki parts. There were only 3 back wheels instead of the standard 4 that was used in 82.
The ski's looked slightly different as well, there were reinforcement strips along the sides. This is the only difference in the skis that I could see. They were the round loop style, with the standard short leaf springs, and did not have the LTD style reinforcements.
Other than the obvious modifications that someone did to make it a drag sled, everything else appeared to be the same as the 82's.