A.J. Allmendinger (47) and Kurt Busch (41) make their through Turn 2 at the start of the NASCAR Sprint Cup Series auto race Sunday, June 28, 2015, in Sonoma, Calif. (AP Photo/Eric Risberg)

NASCAR overhauls race and playoff format

NASCAR is dramatically changing its format for the upcoming season, cutting every race into stages that reward points in hopes of making eve…