When it comes to ultimate muscle car power, there's nothing more exciting coming our way than the 2015 Dodge Challenger SRT Hellcat and now, finally, we know exactly how much muscle it will be flexing. Earlier, the automaker said it would be over 600 horsepower but, to everyone's delight, that number was actually too low.
The final numbers have been revealed and, pumping out of the supercharged 6.2-liter HEMI V8 Hellcat engine…