I just bought a rollbar kit for my 2004 Dixie Chopper X2001-50. I started installing it today, when I found the the left side upright was hitting the vertically mounted muffler on the Kohler engine. I worked on it for awhile and decided to call Dixie Chopper. I called the service department and spoke with "Pat". Pat listened to my question, but could not come up with an answer. He just said that if it was hitting the muffler then it wouldn't fit, and to just take it back. I asked him why it would fit, since it was ordered for my model and the model was listed in the book and on the decal on the rollbar itself. Pat said that they must have designed it after mine was built and didn't really know why it was listed for my mower when it would not fit. I told Pat that I wanted a rollbar for this mower, so I wouldn't have to trade it in towards a mower that had one. I asked Pat to find a definite answer, so he put he on hold and went to find someone that could answer my question. Pat soon came back to the phone, and told me that the kohler engine they used, when the rollbar was designed, had a horizontally mounted muffler. Pat said I would have to buy a new muffler or take the rollbar back. I asked him to help me find a muffler, and possibly help me out with the price. He simply replied that I would have to buy one myself. I thanked him for helping me make my decision on whether to buy a second Dixie Chopper. I then called my local dealer, where I bought the rollbar from, who stated that he would call Dixie Chopper and find me an answer. The dealer called back a few minutes later and told me that he had found me a muffler. He stated that the muffler that was used for this application was a Dixie Chopper design, and that he could order one. I asked him why the service person I spoke to couldn't have told me that, and said that he would have it in a couple of days and let me have it for cost. I thanked him, and the muffler will be here by the end of the week. After getting the muffler situation straight, I went back out the the shop and installed the muffler and new Turf Boss tires I had bought. Has anyone else had these types of problems? All I was looking for was an answer to a problem, not someone telling me to just return the part. Oh well, I'll have to remember that when I upgrade to a 60" mower next year.