The Jaguar XJ220 is a two-seater supercar produced by British luxury car manufacturer Jaguar from 1992 until 1994, in collaboration with the specialist automotive and race engineering company Tom Walkinshaw Racing. The top speed of 217.1 mph (349.4 km/h) measured by Jaguar in June 1993 with catalytic converters disconnected and rev limiter increased was in the Guinness Book of Records 1994 to 1999 issues as "the fastest speed ever attained by a standard production car", replaced by 240.1 mph (386.4 km/h) the McLaren F1 showed in 1998 with rev-limiter increased. The Jaguar held the Nürburgring production car lap record between 1992 and 2000 with a time of 7:46.36. The XJ220 was developed from a V12-engined 4-wheel drive concept car designed by an informal group of Jaguar employees working in their spare time. The group wished to create a modern version of the successful Jaguar 24 Hours of Le Mans racing cars of the 1950s and '60s that could be entered into FIA Group B competitions. The XJ220 made use of engineering work undertaken for Jaguar's then current racing car family. The initial XJ220 concept car was unveiled to the public at the 1988 British International Motor Show, held in Birmingham, England. Its positive reception prompted Jaguar to put the car into production; some 1500 deposits of £50,000 each were taken, and deliveries were planned for 1992. Engineering requirements resulted in significant changes to the specification of the XJ220, most notably replacement of the Jaguar V12 engine by a turbocharged V6 engine. The changes to the specification and a collapse in the price of collectible cars brought about by the early 1990s recession resulted in many buyers choosing not to exercise their purchase options. A total of just 271 cars were produced by the time production ended, each with a retail price of £470,000 in 1992.