In 2017, Arctic Cat and Yamaha introduced the world's most powerful snowmobile engine with the release of the SideWinder and 9000-series line-ups. Historic "Japan Built" models (such as the Apex and RS Vector lineups) and most SR Viper models were removed from production to support the sale of "hold-over" units from previous models years at MSRP. This was a new move to the industry in order to support dealerships and sell the large number of previous model year snowmobiles that have remained unsold.