Honda debuted IndyCar Series as engine supplier in 2003 season after a CART successful era. Developed by Honda Performance Development(HPD) with technical support from Ilmor and designated as HI3R, engine's capacity was 3.5-liter. HPD and Ilmor provide trackside support and engine rebuilding services to teams. Honda supplied Andretti Green Racing, Team Rahal, Fernández Racing and Access Motorsports teams. Honda's 2003 stats were 3 pole positions, 6 fastest laps and 2 wins. A revised engine named HI4R was used in 2004 until new regulations came into effect at the 2004 Indianapolis 500.