Dodge describes it as “a beast unlike any in the kingdom” and that’s true, to a point. The 2018 Dodge Challenger SRT Demon offers a spectacular display of what auto manufacturers can do with a factory engine’s horsepower, if they have the will to dream of more … and more. The Demon clocks in with 840 hp. That’s from the factory, not a hotrod someone souped up in their garage. According