NASA 25 Hours of Thunderhill presented by Hawk Performance is Ready for Green on Saturday Mazda dealers, van Overbeek for five, Grip Racing and NP01 with veterans NAPA VALLEY, Calif., (Dec. 1, 2016) - The 14th edition of the NASA 25 Hours of Thunderhill presented by Hawk Performance is ready to take the green flag for twice-around-the-clock plus one-hour of racing December 3-4. Robert Davis, Senior Vice-President, Mazda North American Operations (MNAO), said, "No one ...