High Quality Content by WIKIPEDIA articles! The 2003 IRL IndyCar Series season brought some of the biggest changes in its history. The league adopted the name IndyCar Series, after a settlement with CART prohibiting its use, had expired. Several former CART teams brought their full operations to the IRL, most notably major squads Chip Ganassi Racing and Andretti Green Racing, as well as former CART engine manufacturers Toyota and Honda, replacing Infiniti who shifted its efforts to the new feeder series Infiniti Pro Series. Many of the IRL`s old guard including Robbie Buhl, Greg Ray, and Buddy Lazier had difficulty competing in this new manufacturer-driven landscape. The league, also added its first international race this year, taking over the CART date at Twin Ring Motegi.