Muscle cars don't exist
Muscle cars don't exist anymore because even the Challenger can turn.
I hate to say it, but a lot of these definitions don't make sense any more. Turbo 6 cylinders do under 4 sec 0-60s. A Mercedes SL is a 12 sec drag car. A Camaro can do over 1 g on a skidpad.
Just how does one group cars, the equipment and the performance envelope to support "muscle" "sports" or any other description?