|The coming of the Porsche 917 was driven by rules modifications to slow speeds of the Group 6 Prototypes. The result was a car that still holds the fastest lap at the Circuit de Sarthe in the configuration they ran in 1971. The lessons that influenced the 917 were multifold, including weight savings, aerodynamics, downforce, and one of the only true Boxer 12s in existence. What you see here is the unglamorously named “Pink Pig” which was a test bed for low-drag and aerodynamic concepts. It qualified seventh for its only race at Le Mans in 1971 but crashed during the race when its brakes failed. It currently lives in its butcher’s cut livery at Porsche’s Stuttgart-Zuffenhausen museum, but you can experience its power and glory today in Forza.|
— Official description
The 1971 Porsche #23 917/20 - abbreviated as #23 Porsche 917 - is a prototype race car that debuted in Forza Motorsport 7 for free with the July 2018 update and is featured as standard in Forza Horizon 4.
The #23 917/20 is one-off variant of the Porsche 917 race car that was entered by Porsche in the 1971 24 Hours of Le Mans.
Combining the advantages of the short-tail and long-tail 917 body styles, it had an unusually wide and stubby body that was humorously given a pink livery depicting the butcher's diagram of a pig. As a result, the "Pink Pig" had less drag than the 917K on the Mulsanne straight, while still "providing plenty of downforce" according to Porsche race engineer Klaus Bischof.
The 917/20 qualified for seventh place in the 1971 24 Hours of Le Mans, but failed to finish the race due to malfunctioning brakes.
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