EPI also has an excellent clutch kit for the Teryx. As for the "ain't broke, don't fix it", i'm not buying it.
There are enough stories now, where stock or near stock Teryxs are breaking belts. Rhinos have never done this.
One of the reasons the stock Teryx belt has issues is the secondary spring on the stock clutch is not set up properly. It has too much pressure initially, and is too light as it gets compressed. This causes varied belt tensions (not deflection) and increases belt heat. When the heat surpasses the belt's limit, it fails.
If anyone would like to discuss the finer points of Teryx clutching, don't hesitate to contact me. I also stock the EPI Teryx kit.