As for what Dodge intended when it introduced the SRT Demon back in April of 2017, all it wanted was for the muscle car to defeat any stock rival over a quarter-mile easily. Unlike the SRT Hellcat, the Demon’s 6.2-liter V8 unit is rated at 808 hp (819 PS) with 91 octane gas and 840 hp (852 PS) with 100 octane fuel or higher.