When Alfa Romeo decided to compete in touring car racing with the Giulia in the 1960s, the car’s motorsport baptism at the manufacturer’s racing arm, Autodelta, yielded only minor changes to the base model’s appearance. No doubt a doppelgänger, the form of the lightweight Sprint GTA that resulted from the extensive reengineering betrayed little evidence of the genetic shift that had taken place—its skin looked the same, but it was reconstituted in aluminum, magnesium, Perspex, and, for the roof, a unique alloy called Peraluman 25.