Car: Ford Mustang Mach 1
What makes it special: It was the final year for "The Big Mustangs", the year before the gas crisis and need for better fuel economy forced Ford to create the Mustang II the following year. For the first time, the front bumper was enlarged in accordance with new NHTSA standards, and its rear bumper was also mounted on new impact-absorbing extensions which caused the bumper to protrude from the body further than before.
What made it famous: Due to trouble getting the Ram Air option approved for emissions reasons,Ford substituted an "Exterior Décor" option for '73 that consisted of the two-tone hood treatment, but without the actual functional components of the Ram Air system. Actual engine options available with Ram Air for that year were limited to the 351 2-barrel, even though the 351 4-barrel "Cobra Jet" without Ram Air remained optional on every model.
Why I would want one: It's the last of the big year Mustangs, it's also the last year before emissions and pollution devices went haywire. Even though it's past its glory by 1973, it still a good looking, although de-tuned muscle car.
Fun fact: A matte black 1973 Ford Mustang Mach 1 was prominently featured in the 1990 Steven Seagal movie "Marked For Death", eventually being crushed by a bulldozer and blown up with a Molotov Cocktail.
( 1973 Mustang Mach 1 photo from mustangattitude.com )