The steamy news from camp Polaris is the 800 Pro-RMK 155. According to Polaris, the sled holds a dry weight of 417 pounds!
New-for-2013 features include Polaris' Quick Drive Low Inertia drive belt system, new Pro-RMK seat that is shorter and shallower where needed, and a nice complement of carbon fiber on the front suspension.
Given the 155 Pro's weight loss and advancements our week-long test session, we have it in a preliminary dead heat as our editor's choice as mountain snowmobile of the year with the 2013 Ski-Doo Summit X 154.