Dig into Porsche's top 5 secret prototypes

2002 Porsche Cayenne Cabrio prototypeEvery automaker has experimented with concepts over the past decades, but most aren't too keen to show off what could have been. Porsche? Not so much. The brand has curated its top five secret prototypes for the latest in the ongoing "Top Five" YouTube series. As the title suggests, the latest episode looks at five obscure prototype cars many...

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