Even the M2 CS only makes 444 hp. So that would mean your car is modified and not stock. Also, does it have a V8? Oh it doesn't? Ok then, I guess that answers your question. The 485 hp Charger also comes with a factory warranty, though I'm not sure how that dictates whether a car is a muscle car or not.


en.wikipedia.org
It would be interesting to know how something like the 2018 Dodge Demon doesn't qualify as a muscle car. And a '67 Mustang would be a pony car if you're into splitting hairs as you appear to be.