Well I think I found different rear gear ratio's. Unfortunatly, the retail on the unit is around $1,100. Apparantly they also changed castings right after the first month or so of production. The early ones are heavier but stronger, the lighter ones are having problems holding up and they are trying to go back to the heavier castings. I am trying to get more info and will post as I get it. Knowing the dealer pricing they will problably sell around $900.