BRASELTON — Most people know the thrill of being handed a freshly laminated driver’s license at 16 years of age, but not many have experienced the thrill of getting the keys to a 450-horsepower supercar at 16, especially at the prestigious 24 Hours of Le Mans. In fact, no 16-year-old had ever felt that thrill until Matt McMurry became the youngest driver ever to compete in the 24 Hours of Le Mans just last year. “It’s such a big show,” McMurry said.