 In 2003, Honda transferred its effort to the IRL IndyCar Series with Ilmor supporting HPD.In 2004, Honda-powered cars overwhelmingly dominated the IndyCar Series, winning 14 of 16 IndyCar races, including the Indianapolis 500, and claimed the IndyCar Series Manufacturers' Championship, Drivers' Championship and Rookie of the Year titles.From 2006 to 2011, Honda was the lone engine supplier for the IndyCar Series, including the Indianapolis 500.