The 917/20 Turbo is a confusing car - its chassis number reads 917/30-001, but it is not the real 917/30. In its first race it was called as the 917/10 Turbo. Sharp eye can detect that it was not just the 917/10 Turbo, but an evolution of it. At the same time it was not the evolution of the 1971 Le Mans 917/20. Still, the car should not be called as the 917/30 to distinct it from the "real" 917/30 Can-Am racers and in 1974 it was decided to call it as the 917/20 Turbo.