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Asleeper (American English) or Q-car (British English) is a car that boasts high performance while having an unassuming exterior.[1][2][3] Sleepers are usually developed on the platform of a non-athletic class of vehicle, most often that of an economy car. In addition to looking modest, a sleeper car may sometimes appear to be a "beater" — a car that is in a visibly poor condition due to seeming neglect and lack of maintenance on the owner's part — though this is intentional and commonly described as "all go and no show"; these cars are internally modified to achieve very competitive levels of performance while being presented as a standard or neglected car. The American name for this type of vehicle comes from the term sleeper agent, whereas the British name is derived from the Q-ships used by the Royal Navy.
The British term has been in use since the aftermath of World War II. In the February 1963 issue of Motor Sport magazine, British journalist Bill Boddy states: "the modifications carried out by Lotus have turned the Lotus Cortina into a 'Q' car par excellence" in a highlight of the high-performance Cortina's unassuming exterior. Likewise, in the 1956 British film The Long Arm (known as The Third Key in the United States), the term is used in reference to unmarked police cars patrolling the city of London by night, indicating that it was in use among British law enforcement at least a decade earlier.[4]
In July 1964, British magazine Motorcycle Mechanics carried an announcement from editor Bill Lawless of the use of two unmarked police "Q-cars" — a black Daimler SP250 and a green Austin A40 Farina — patrolling the A20, a road between London and Maidstone.[5]
The Chrysler 300 letter series began in 1955 with the Chrysler C-300.[6][7] With a 331 in3 (5.4 L) FirePower V8, the engine was the first in a production passenger car to be rated at 300 hp (220 kW), and was by a comfortable margin the most powerful in American cars of the time. By 1957, with the 300C, power was up to 375 hp (280 kW).[citation needed] These cars were among the first sleepers,[citation needed] marketed as high-end luxury cars from the traditional luxury marque Chrysler, but with a high-end homologation racing engine. However, these cars lose their "sleeper value"[opinion] due to both their rarity (this series was highly luxurious; it was made in limited numbers and examples are very expensive), and the well publicized successes of Carl KiekhaeferinNASCAR racing (1955–1956); though the model is an important precursor of the muscle car.
The 1968 Mercedes-Benz 300SEL 6.3 was a powerful sedan with a subdued exterior.[6][8][9] A trend of overtly powerful saloon cars with subtle body modifications is exemplified by the work of Mercedes-AMG and Brabus on unassuming Mercedes saloons.
The 1986 Lancia Thema 8.32, fitted with a Ferrari V8 engine, has been described by Road & Track as "one of the weirder sleepers to come out of the 1980s".[10][11]
The car which is most often credited[who?][citation needed] as the start of the production Q-car trend in Europe is the 1990 Lotus Omega, which started out as an Opel Omega/Vauxhall Carlton.[6][12]
The first Q-car was invented by the Soviet NKVD in 1938,[citation needed] when imported Ford flathead V8 engines were installed on GAZ M-1 cars. After WWII they were replaced by GAZ M-20G cars equipped with adapted powertrain from GAZ-12 ZIM and special-purpose equipment. Those, as well as their successors, were available either in black color (or possibly GAI road police livery) for the security details of the KGB's 9th Directorate or in common colors for the surveillance teams of the 7th Directorate. After the M-20 was discontinued, 603 GAZ-23 cars were produced in 1962-1970, combining modified GAZ-21 body with slanted GAZ-13 engine and transmission, better brakes and KGB equipment. They were followed by similar GAZ-24 modifications: GAZ-24-24, -25, -34 and -35, over 2000 mostly produced during 1970s and 1980s. GAZ-31012 and 31013 based on the GAZ-3102 were only produced in black in very small numbers (~300) starting from 1985. In Post-Soviet Russia the practice was discontinued, with special services acquiring imported cars.[who?][citation needed]
Some vehicle owners create sleepers by swapping more powerful engines,[13] or making other performance modifications, like adding a superchargerorturbocharger, leaving the external appearance as it came from the factory. Sometimes hints of the car's true nature are visible: wider tires, a lower stance, or a different engine tone or exhaust note. Gauges and instrumentation are often kept to a minimum. Some owners go as far as to use weight reduction techniques employed by other performance enthusiasts, removing items not fundamental to street racing, such as rear seats, trim, spare tire, air conditioner, power steering, or heater; bumpers and headlights may also be replaced with lighter items.
