At the age of 40, DeLorean had broken the record for youngest division head at GM and was determined to continue his string of successes. Adapting to the frustrations that he perceived in the executive offices was a difficult transition for him. DeLorean believed there was an undue amount of infighting at GM between division heads, and several of Pontiac's advertising campaign themes met with internal resistance, such as the "Tiger" campaign used to promote the GTO and other Pontiac models in 1965 and 1966. In addition, there was Ed Cole's decision to ban multiple carburetors, a method of enhancing engine performance used by Pontiac since 1956, starting with two 4-barrel carburetors ("2x4 bbl") and Tri-Power (three 2-barrel carburetors ("3x2 bbl")) since 1957.