Even though it was raced as a private entry, Mitchell was pressured by GM to withdraw the car from competition in accord with the AMA ban. He eventually acquiesced, and the Stingray was retired from racing. It then underwent a series of modifications.
Despite being entered into racing as a personal vehicle, Mitchell was persuaded by GM to pull the Stingray from competition due to the AMA ban. Eventually, he relented, and the car was removed from racing. Subsequent modifications were made.