The Lechner Spyder SC91 was a sports prototype racing car, originally built by Reynard Motorsport for Walter Lechner and his Walter Lechner Racing School Interserie team in 1991. The car was rebuilt as the Reynard Spyder in 1993, and became known as the Reynard Horag in 1997. Throughout its career, it used a Formula 1-derived 3.5-litre Judd V10 engine. One car was built, and it proved successful; taking the Interserie Division I title in 1997 and 1998, in addition to being the strongest non-Porsche 962 in 1991, and the strongest non-Kremer CK7 Spyder in 1993.