The path toward an even more competitive brand of racing in NASCAR's top series took its first steps Monday at Michigan International Speedway as a select group of teams tested potential options for the 2015 rules package. Six configurations were scheduled Monday at the 2-mile track with NASCAR and teams gathering data for potential new rear differential gear changes, aerodynamic enhancements, horsepower optimization and a driver-adjustable track bar. Gene Stefanyshyn, NASCAR Vice President of Innovation and Racing Development, said that the emphasis of the single-day test was on the intermediate-sized tracks that dominate the NASCAR Sprint Cup Series schedule. "We're testing quite a wide gamut here," Stefanyshyn said. More...