1973 Porsche 911 Carrera RS 2.7

This is a street-legal version of the Porsche Carrera RSR race car, which won three of 1973's top endurance-racing competitions: 24 Hours of Daytona, 12 Hours of Sebring and Targa Florio.

"The RS 2.7 was the first road-going 911 to show us where (the line) was headed -- with more displacement, wider rear wheels and aerodynamics that would tame some earlier 911s' troubling tendencies," Stout says.

He says top-quality versions of the car sell for $500,000 and up today.

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