The Mitsubishi Lancer Evolution, colloquially known as the Lancer Evo or Evo,is a car manufactured by Mitsubishi Motors. There have been ten official versions to date, and the designation of each model is most commonly a roman numeral. All of them share a two litre, turbocharged engine and four-wheel drive system. Evolution models prior to version VII were the homologation models for Mitsubishi's efforts in the World Rally Championship. In order to follow these rules, the Evolution was based on the same unibody as the Lancer.