Dodge promised the Challenger SRT Demon would be both the fastest and the most advanced muscle car ever built, and the New York auto show debut in April 2017 had to prove it. The 840-horsepower figure handled the fastest part, but it was the technology, from Performance Pages and tire-specific launch control to a factory TransBrake and drag-mode suspension, that made the second claim stick. Read on to find out how Dodge made brute force and sophistication work together.