Raluek posted:

That's what makes it a pony car, by definition. A muscle car is a mid-size with the big engine (which is usually reserved for the full-size), and a pony car is a compact with a bigger engine (doesn't have to be the biggest, 289 Mustangs are pretty cool, but bigger than compacts usually get).

The Mustang shares a lot with the Falcon (a compact), and the Camaro shares a lot with the Nova (a compact). Makes you wonder about the Challenger, though.