In mid-2003, Cosworth provided the 3.5 L V8XG badged as a Chevrolet Gen 4 engine to IRL IndyCar teams. Sam Hornish, Jr. went on to win 3 races that season with the new XG. The XG was reduced in size to 3 L for the 2004 season and it won one race in 2005 during Chevrolet's final season in IRL.
