The actual degree to which the cars conform to standard model specs has changed over the years and varies from country to country. Today most American stock cars may superficially resemble standard American family sedans, but are in fact purpose-built racing machines built to a strict set of regulations governing the car design ensuring that the chassis, suspension, engine, etc. are architecturally identical on all vehicles. For example, the NASCAR Sprint Cup series now requires fuel injection. The closest European equivalent to stock car racing is probably touring car racing. In the UK and New Zealand there is a racing formula called stock cars but the cars are markedly different from any road car one might see. In Australia there was a formula that was similar to NASCAR called AUSCAR, but it has been ended, and a form of touring cars has taken its place (this is known locally as "V8 supercars", featuring the Bathurst 1000 and Clipsal 500).