Honda designed a new engine to address the 2004 IRL rule change which required reduced displacement. Developed once again by Ilmor and designated as HI4R-A, its capacity was 3.0-liter and debuted at the 2004 Indianapolis 500. With subsequent evolutions named HI5R and HI6R, Honda was clearly dominant engine, scoring 33 poles, 35 fastest laps, 41 wins totally in three seasons including 3 Indianapolis 500s. Since Chevrolet and Toyota leaves IndyCar Series after 2005 season, Honda won exclusive tender IndyCar Series engine supplier for 2006 to 2011 season.