The Porsche 917 Spyder entered in European races from 1971 can be considered technically very close to the 917 PA driven by Jo Siffert in the 1969 Can-Am. The three cars seen in Europe achieved several successes in the Interserie championship. The Neuhaus 917 also received two rear fins; equipped with the 4.5 and 4.9 liter 12-cylinder carbureted engines (560 and 600 horsepower respectively), the Spyder 917s continued to run until 1975.