I love listening to Dieter Landenberger (head of the historical archives at the Porsche Museum) as he describes a Porsche in the collection. He always sounds just a touch out of breath making his enthusiasm and excitement contagious. In this video below, Dieter explains Porsche's aerodynamic study from 1984. This particular prototype 911 had an aerodynamic coefficient of 0.27 vs. 0.40 for a production 911 of that era.
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Video: Porsche Museum Secrets