In 2003, NASCAR unified the rules for the Busch North (now Busch East) and the West Series, forming the Grand National Division for cars in both series, concluding with the Toyota All Star Showdown in Irwindale, CA, for the Grand National championship. The series ran two seasons without a sponsor before AutoZone took over sponsorship of the West series, following NASCAR's announcement to discontinue the AutoZone Elite Division after 2006, due to declining support in all four Elite Divisions. The other regional division at the Grand National level of NASCAR is the Busch East Series.