Ford Sierra RS500 Cosworth was the ultimate evolution of Ford’s turbocharged touring car dominance in the late 1980s. Built as a homologation special, the RS500 featured a strengthened Cosworth-developed 2.0-liter turbo four-cylinder producing well over 500 horsepower in race trim. Massive rear wing, aggressive aerodynamics, and brutal straight-line speed made it nearly unbeatable on fast circuits worldwide. Dominant in DTM, BTCC, and endurance racing, the RS500 became the benchmark Group A mons