The 2015 Dodge Challenger SRT Hellcat comes from the factory with a genuine 707 horsepower. Yikes, that’s a full 282 HP higher than the Challenger’s Hemi-powered namesake of the 1960s and current Viper’s 8.2-litre V10 produces a mere 640. Frankly, the Hellcat is more powerful than [insert your own hyperbole …