1973 Porsche 911 Carrera RS 2.7 Homologation

Coming up for auction is what might be the 911 in its purest form — and rarest — form. This 1973 911 Carrera RS 2.7 Homologation is one of 17 of the lightweight road-going race cars built and has been restored to a concours level by specialist Nate Cantwell. Finished in Grand Prix White with red striping and red Fuchs wheels, the car was originally designed to compete in the FIA's Group 4 GT series. That required building at least 500 road cars, with Porsche eventually completing 1,525 units, with the first 17 designated with the RS Homologation tag. The RS Homologation featured a lightened shell, flared fenders to cover wider wheels and tires, and upgraded suspension components. The rear seat was removed, and thinner glass and ultra-thin felt carpeting replaced the standard fair. The 2.4-liter flat-six was punched out to 2.7 liters, making 210 horsepower, giving the RS impressive numbers, especially in the '70s — 0-60 in 5.5 seconds and a top speed of 150 MPH. The car goes to auction at Gooding & Co.'s Amelia Island event in March.