I have a 13 pro with a 163 track. I installed the TKI kit last year and put about a 1000 miles on it. No problems what so ever. I have it geared down to 2.52 ratio. Indy Dan suggested that I should gear it down that low because of my height and weight. With his clutch kit and balance job. I'm 6-6 and bout 300Lbs. That works for me. Tom is great to do business with and great customer service. I am totally satisfied with my TKI drive system.