I know the center pillar on a four door offers strength on uni-body construction, but why try and brand a 4 door as muscle car. You would think the people who would be the likely buyers (baby boomers) would have remembered the 2 door muscle cars of their youth.
The only 2 door cars GM makes is the Camaro and Corvette.
Dodge at least made the Challenger at 2 door.
1. Folks are used to 4-door cars being good performers, nowadays.
2. The last several common American coupes made in large numbers were pretty awful performers(1).
3. "Likely buyers" are mostly not baby boomers who saw the original muscle cars when they were new.
(1) The Pontiac Gran Prix of S**t. The Chevy Lumina Eurosport POS Edition. Chrysler LeBaron K-car (Polished Turd Edition). Chrysler Sebring Coupe! The Ford Thunderbirds (pre-convertible retro-model) were somewhat better than mediocre.