Photo Credit: Uncredited Photographer/IMS LLC Racing has always been the ultimate proving ground for automobiles. Not only has competition promoted innovations big and small, race cars have also influenced overall vehicle appearance. At the 1967 Indianapolis 500, the STP-Paxton TurboCar fielded by the late Andy Granatelli provided a shocking example of how much racing at the speedway evolved over 56 years. Ever since the first 500-mile event was held at the 2.5-mile rectangular oval Indianapolis Motor Speedway in 1911, the winning Marmon Wasp with a rearview mirror paved the way for what would be a grand showcase of automotive development. Accompanying “The Greatest Spectacle in Racing,” advancements in automobile technology showed greater sophistication with every passing decade in the quest for more speed. During the 1920s and 1930s, American race car designer Henry Miller offered groundbreaking engines to the Indianapolis 500. Miller also gave front-wheel drive technology it...