03 SVT VERT said:A muscle car wasn't just defined by power, if you grew up in the 60's/70's then you would know a muscle car was always a full size car (5 or 6 seats), while a pony car was always a smaller car with 4 seats. A pony car kinda filled the gap between american sports car and american muscle car. The new GTO and the new mustang only have 4 seats, so both are really pony cars. The new 300C/Hemi Magnum is one of the few cars produced today that is a true muscle car: affordable, powerfull, full sized.
I dont' think they have to be full size car to be considered a muscle car.... Look at the cars like the NOVA. It and a few others are not what I would call afull size car, yet they were considered muscle cars...