Volkswagen is unleashing a speedier bug today with the world premiere of the 2014 Beetle GSR at the Chicago Auto Show. Forty years ago, VW introduced the original GSR, an acronym for Gelb Schwarzer Renner (German for "yellow black racer") for its bold colors. The 3,500 GSRs built in the 1970s were the sportiest Beetles on the planet, boasting a 50-horsepower engine.