Let's be honest: modern Porsches packs some impressive performance and are certainly more refined than their earlier predecessors, it's the automaker's classic race cars that really grab our attention. Like this rare 904/6 Carrera GTS prototype from 1963. Chassis number 906-002 is one of only five surviving cars of its type. An early factory development car, this six-cylinder beauty was the second of Porsche
's 904/6 factory test cars, serving to help the company test new components in the 60s.