Of course, not everyone can access the Hellcat's full fury: the 2015 Dodge Challenger SRT will come with a red key that enables all 600 - plus hp, and a black key that offers only 500 hhp The car also has a valet mode, enabled with a four - digit PIN, that limits the engine to 4000 rpm, doesn't allow disabling the traction control, disables launch control, turns off the paddle shifters, and similarly reduces overall output to 500 hp. (automobilemag.com)