Footage of the last 2018 Dodge Challenger SRT Demon as it rolls off the line at the Brampton Assembly plant in Brampton, Ontario. (May 30, 2018) The first step toward making horsepower history at the June 20-23 Barrett-Jackson Northeast Auction. The limited-production, world record-setting 2018 Demon and the last 2017 Dodge Viper hand-built American supercar will be auctioned as a pair in “The Ultimate Last Chance” end-of-an-era offer with 100 percent of the hammer proceeds from the sale going t