The 2004 Ford Mustang Mach I. The first Mach 1 appeared in 1969 - a high performance model with a sleek, fastback body style. They were famous for their "Shaker" hood scoops - a Ram Air turret, clamped to the carburetor and rising through a hole in the hood - which visibly vibrated, when you punched the throttle. The Shaker is back in the new Mach 1 - still on the job, shakin' its scoop and sucking down more air for more power. What it's feeding is Ford's 4.6 liter, DOHC V-8. Few vehicles have consistently maintained their relevance over four decades - in fact, the Mustang may be one of the few that can boast such longevity. In that time, the Mustang has evolved into what it is, to be sure - but it has also served as a barometer of sorts for the changing tastes and trends in American - from 1960 and into the 21st Century.