Muniz provided the character voice of a zebra named Stripes, who wishes to become a racing equine, in the 2005 film "Racing Stripes." That same year, he made a guest appearance as himself in "Mr. F," an episode of the Fox comedy "Arrested Development." In April 2006, he began filming "My Sexiest Year," an independent film in which Harvey Keitel played his father. He announced, during that same month, that he would be taking a break from acting, in order to pursue a career in race car driving, under a full-time two-year deal with Jensen Motorsport in the Formula BMW competition.