In Pixar's Cars, the Italian tire shop owner in Radiator Springs is Luigi.
Luigi runs Luigi's Casa Della Tires, a tire shop decorated with Italian racing imagery. He is a small yellow Fiat 500 whose enthusiasm for Ferrari gives him a strong connection to Italian motorsport. His excitement becomes especially clear when a famous Ferrari visits Radiator Springs near the end of the film.
Guido, Luigi's assistant, is a blue forklift who works in the tire shop and performs rapid tire changes. Because the two characters appear together and have related Italian identities, viewers sometimes confuse their roles. Luigi is the shop owner; Guido is his assistant and tire-changing specialist.
Luigi and Guido return in Cars 2 and Cars 3. Luigi is voiced by Tony Shalhoub, while Guido communicates mostly through expressive sounds and gestures. Their shop is one of Radiator Springs' key landmarks.