Carstin "Ace" Dillon is a Next-Gen race car that competes in the Piston Cup Racing Series with the number 3 for the Sidewall Shine team. He does not appear in Cars 3, but instead he has been released as a diecast toy car by Mattel as a part of their collaboration with NASCAR.
He is named after Austin Dillon, the NASCAR Cup Series driver, who has drove the #3 car since the 2014 season.