Commentaires I did get to drive this one for a couple of nights. It is incredably quiet, which is a welcome improvement over the current tier3 Bison. Also, Caterpillar increased the power of the engine, however Prinoth has not yet released those numbers, but I can tell you it is noticeable. Along with the increased power, the ECU does a better job of managing the engine. Even pushing snow in the terrain park, this cat did not once bog down. The rpms stayed right where I set them and the power was constant.