The 2015 Dodge Challenger SRT Hellcat has a 707 horsepower supercharged engine making it the most powerful engine in Chrysler's history. It has two transmission options - a 6-speed manual sourced from Viper or an 8-speed automatic. The Hellcat has Brembo brakes, a 3-mode suspension, 3-mode traction control, and gets up to 20 mpg highway. It has customizable drive modes and gauge displays to provide performance feedback and times to the driver.