NASCAR will stick with its original 2015 rules package throughout the Chase for the Sprint Cup after switching to track-specific packages for a handful of races recently.
A high-drag aerodynamic package was used at Indianapolis Motor Speedway last month and will be in place again this weekend at Michigan, and it received some criticism from drivers. But a low-downforce package put in place at Kentucky was more popular, and it will be used again at Darlington next month.
But when the 10-race Chase begins Sept. 20 at Chicagoland, the original rules will be used.
Steve O'Donnell, NASCAR's executive vice president and chief racing development officer, announced the decision Friday after a meeting with drivers at Michigan.