Ok so i picked it up from a guy who used it around his 1 acre property since he bought it new in 2000. Meticulous records were kept all the way down to oil changes that he provided me with. I noticed the CVT filter had some fray from the CVT belt so i put a new belt on and new CVT filter. Also put new fuel filter and regular air filter on. When i tested it out i didnt really get on to it but i didnt really have any power issues. Took it to the lease the last weekend and starts fine idles fine and run fines however once i get to roughly 13 mph it can not or will not go any faster and it starts makeing almost like a air blow out sound coming from the mufflar from time to time when i am floored. Also my brother has the same exact mule and i used his for a bit this season and i could tool around my place all day on sat and sun and burn maybe a quarter tank of diesel. On mine i hunted hard so was only used for to and from stand each day and checking feeders and burned almost half a tank of fiesel. I am pretty sure it is a fuel related issue almost sounds starved however it used alot so i dont know. I ordered the service manual and it should be in before the end of the week just hoping someone has seen or experienced an issue like this.