of Group S angered many rally insiders who believed the new specification to be safer than Group B and more exciting than Group A. The Group S concept was revived by the FIA in 1997 as the World Rally Car specification, which persisted until 2021. WRC cars were limited to and required 2500 examples of a model but, unlike Group S, also had to share certain parts with their base production models. Circuit racing From their introduction in 1982 Group B found a home in the World Endurance Championship, a new name for the World Sports Car Championship, though were secondary to the racing prototype Group C cars. The 1983 season had the first significant entry list including Porsche 930, BMW M1 and Ferrari 308 GTB LM vehicles. Porsche won the FIA GT Cup in 1983, handing it over to BMW in 1984 and 1985. From 1986 the championship retired Group B in favour of IMSA regulated cars and the championship became known as the World Sports-Prototype Championship the same year. The Porsche 961 prototype, intended to be the basis for a Group B homologation, won the GTX class at the 24 Hours of Le Mans 1986 race but crashed and caught fire in 1987. The Ferrari 288 GTO was built and sold the minimum requirement of cars to the public, but never saw action in its category. The WSPC grids it was intended for was filled up by a batch of Group C cars (there would be no production sports car-based racers in European racing, including Le Mans, until 1993), but it saw limited use in an IMSA GTO race in 1989. Legacy The era of Group B is often considered one of the most competitive and compelling periods in rallying. The combination of a lightweight chassis, sophisticated aerodynamics and massive amounts of horsepower resulted in the development of a class of cars whose performance has not yet been surpassed within their category, even three decades later. In reference to their dubious safety record, the class has also earned an unsavoury nickname among rally enthusiasts: "Killer B's". In contrast to this, many enthusiasts refer the Group B era as the Golden Age of Rallying. Many racing video games feature Group B cars for the player to drive. The 2017 video game Gran Turismo Sport features a rally car category known as "Gr. B", an obvious homage to Group B.