sentences:  USAC continued to sanction their Gold Crown Championship, resulting in two parallel national championships for 1979.The controversy over the first "split" in Indy car racing came to its first climax at the 1979 Indianapolis 500, when USAC rejected entries by certain CART owners.The owners won a court injunction to be allowed to race, and later, another controversy erupted, this time involving illegal wastegate exhaust pipes.