Supercars is a touring car racing category based in Australia and run as an International Series under FIA regulations. The vehicles used in the series are loosely based on road-going, four-door saloon cars. Cars are custom made using a control chassis, with only certain body panels being common between the road cars and race cars. To ensure parity between each make of car, many control components are utilised. All cars must use a 5.0-litre, naturally aspirated V8-engine.