Its custom. I lowered the sled by cutting the spindle housing 1 3/8 off the bottom than cut and welded the spindle shorter, and turned it down, I only did one so far, to make sure that it would work. You also have to modify the belly-pan a little, but it clears everywhere else. In theory, it puts the engine farther over the front skis and shortens the "wheelbase" while taking the center of mass down in the front. My goal is to put more pressure on the skis for turning and also hopefully reduce the need for ski spreaders for stabilization. We'll see if this works or not, the changes are pretty small to guarantee anything but it will at least look cooler being lower (: (the reason I don't just switch to race skis, besides the price, it removes me from a class that I would be competitive in and gives me less time on the ice)