I put the kit on my 2188 middle of 2007 soybean harvest. It only slows down the shoe, spreader, and the auger bed. It changes to a bigger driven pulley on the cleaning fan jack shaft. New pulleys, belts, and chains are supplied to speed elevators and cleaning fan back up to factory settings. I do not remember the diameter difference between standard and slow down pulleys but my dealer looked up the difference at the time of purchase and told me. I did not notice any difference in performance after installation and I did not have to change any settings.