Its primary destination was Group B but the 959 ended up only racing at the 1984 (although at this time it was merely a hybrid of the 911 and of the 959 prototype), 1985 and 1986 rally Paris-Dakar, and at the 1986 and 1987 24h of Le Mans (Porsche 961).
In 1984 three modified 911 SC RSs (essentially 911 and 959 hybrids), built by Prodrive were entered in the Paris-Dakar rally raid. Running 220hp engines to cope with low octane fuel, they managed to finish 1st with René Metge at the wheel, 6th with Jacky Ickx and 27th with Porsche support engineer, Roland Kussmaul.
Porsche then entered three development versions of the 959, although these were closer to the final car, for the 1985 edition of the rally. Driven by Metge, Ickx and Jochen Mass all three cars retired due to various accidents.
At the 1986 edition, though, the fully evolved 959 shined: Metge won the rally, with Ickx 2nd and the third 959, again driven by Roland Kussmaul finishing in 6th.
The later Paris-Dakar versions developed closer to 600hp.