V8s are common in purpose-designed engines for racing cars. They are a common engine configuration in the highest levels of auto racing. The V8 engine is used in the United States where it is required in IRL and NASCAR. V8s engines are also used in Australian auto racing, most notably in the V8 Supercars. Formula One began the 2006 season using V8 engines, which replaced the V10. Formula One made this change to reduce costs and lower power. However Formula One replaced V8 with V6 Turbo in 2014