The Porsche 911 GT3 is a higher performance version of the Porsche 911 sports car primarily intended for racing. The GT3 is named after the Fédération Internationale de l'Automobile (FIA) GT3 class it was designed to compete in. The 911 GT3 RS 4.0 is the final evolution of the 997 and features a 4.0 litre engine. Only 600 cars were built. (courtesy of Wikipedia)