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A muscle car is an automobile with a high horse power engine, modest weight, capable of producing high levels of acceleration.[1] The term principally refers to American, Australian and South African models and generally describes a 2-door rear wheel drive mid-size car with a large, powerful V8 engine and special trim, intended for maximum torque on the street or in drag racing competition. It is distinguished from sports cars, which were customarily considered smaller, two-seat cars, or GTs, two-seat or 2+2 cars intended for high-speed touring and possibly road racing. High-performance full-size or compact cars are arguably excluded from this category, as are the breed of compact sports coupes inspired by the Ford Mustang. Other factors used in defining classic muscle cars are their age and country of origin. A classic muscle car is usually made in the U.S. or Australia between 1964 and 1975. The term "muscle car" did not enter common usage until after production of the cars had essentially ended. It is generally accepted that popular, widespread usage of the term took hold by the early to mid-1980s. During their heyday, print media usually referred to this class of vehicle as "supercars.The muscle cars' performance soon became a liability during this period. The automotive safety lobby, which had been spearheaded by Ralph Nader, decried the irresponsibility of offering such powerful cars for public sale, particularly targeted to young buyers. The high power of the muscle cars also underlined the marginal handling and braking capacity of many contemporary cars, as well as the severe limitations of their tires. In response, the automobil insurance industry began levying punitive surcharges on all high-powered models, soon pushing many muscle cars out of the price range of their intended buyers. Simultaneously, efforts to combat air pollution led to a shift in Detroit's attention from power to emissions control, a problem that grew more complicated in 1973 when the OPEC oil embargo led to price controls and gasoline rationing.
With all these forces against it, the market for muscle cars rapidly evaporated. Power began to drop in 1971 as engine compression ratios were reduced, high-performance engines like Chrysler's 426 Hemi were discontinued, and all but a handful of performance models were discontinued or transformed into soft personal luxury cars. One of the last hold-outs, which Car and Driver dubbed "The Last of the Fast Ones", was Pontiac's Trans Am SD455 model of 1973–1974, which had performance to rival most any other muscle car of the era. The Trans Am remained in production through 2002, but after 1974 its performance, like those of its predecessors and rivals, was restrained.
While performance cars began to make a return in the 1980s, spiraling costs and complexity seem to have made the low-cost traditional muscle car a thing of the past. Surviving models are now prized collectibles, some carrying prices to rival exotic European sports cars.