In Pixar's Cars, what is the name of the championship trophy?

The championship trophy in Pixar's Cars is called the Piston Cup.

The Piston Cup is the main prize in the film's stock-car racing championship. Lightning McQueen enters the final race as a rookie contender, alongside veteran champion The King and aggressive rival Chick Hicks. A three-way tie at the finale leads to the unusual decision to hold a tiebreaker race.

The trophy's name is a mechanical pun, referring to pistons inside an internal-combustion engine. It is not the same competition as the World Grand Prix introduced in Cars 2. Dinoco is a major racing sponsor and brand in the Cars universe, but “Dinoco Cup” is not the championship's official name.