Car: Plymouth Barracuda
What makes it special: The '66 Barracuda was given new taillights, front sheet metal, dashboard, stronger bumpers, and an interior center console was also now available.
What made it famous: It's huge rear window. Also, Plymouth began to position the Barracuda away from the Valiant model that shared it's platform. For the first time, a Barracuda-specific stylized fish logo was introduced that year.
Why I would want one: An upgraded 235 hp, 273 Commando V8 version was available with a 4-barrel carburetor, 10.5:1 compression, also a more aggressive camshaft with solid tappets in the Barracuda Formula S package.
Fun fact: Although the Plymouth Barracuda pre-dates it's Ford Mustang competition by two weeks, the Mustang is most associated with being given a "Pony Car" distinction first. Plymouth's executives had wanted to name the car "Panda", but the name idea was unpopular with the car's designers. So, the name Barracuda was chosen instead. Good call...
Photo from cargurus.com