One-upping the mighty 707-horsepower Dodge Challenger Hellcat probably seemed impossible, but there is another Challenger. Literally. The new Demon uses a similar supercharged 6.2-liter V-8, but with 840 horsepower and 770 pound-feet of torque (on 100-octane racing fuel). The internal components have been strengthened to accommodate the extra grunt, while a larger supercharger produces additional boost. A ‘Power Chiller’ also directs cool air from the air conditioning system to help reduce the power-robbing heat soak that occurs between runs down the track. The Demon loses, among other things, the front passenger seat and rear bench, for a 200-pound weight reduction (to 4,250 pounds). Zero-to-60-mph takes 2.3 seconds and a quarter-mile time is 9.65 seconds at 140 mph. Expect a $70,000-plus price tag when the limited-production Demon arrives this summer. And yes, it’s covered by factory warranty.