The ideal snowmobile for deep snow. You think it reacts, even to the wildest ideas. That s what the new BoonDocker RE 3900 850 ETEC is all about. This sled is fantastic for big jumps and rough terrain. Mass centralization of Radien platform, highpowered Rotax 850 ETEC engine, and PPSDS rear suspension make it perfect sled for aggressive deep snow riding.