Before there was the nutty-as-a-fruitcake FIA Group B racing, there was the only-slightly-daft FIA Group 5. Group 5 is the series that saw the 1500 hp Porsche 917 in 1970 and ’71 and the Porsche 935 later in the decade. The Group 5 formula changed significantly over the decade, as demonstrated by the two vastly different examples of racers that Porsche entered into competition. Whereas the 917 was a pure prototype with only 25 built (under the watchful eye of one Ferdinand Piëch), the rules were later changed to force manufacturers into entering “special production cars” that had to be based on normal production models, which is why the 935 was based on the 911 Turbo. In Group 5, the 935 competed with the likes of the Ferrari 512BB LM, the BMW 3.0CSL, and the BMW M1. Despite the stiff competition, the 935 won a full 33% of the races it entered, including the outright win at the 1979 24 Hours of Le Mans, 6 wins at the 24 Hours of Daytona, 3 wins at the 1000km Nürburgring, and 6 wins at the 12 Hours of Sebring.