The 917 was so powerful and difficult to control that it was blamed for multiple fatal accidents when it debuted.
Porsche re-engineered it into the dominant endurance racer that won Le Mans in 1970 and 1971.
Its Hollywood connection to Steve McQueen's Le Mans helped drive the 2017 sale to $14 million.
A car nearly too dangerous to race competitively, made even more valuable by a movie.
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