Australia's modern Formula Vee car rules are the definition for Formula First in these countries The class is based on the pre-1963 Volkswagen Beetle, utilizing a collection of stock parts to form a competitive race car around a purpose-built tube frame and racing tires.[citation needed] Over the years, the rules have evolved to improve performance, lower cost, and to allow the replacement of discontinued parts.The lack of these features, the limited engine power, and the similar performance of the cars makes taking advantage of slipstreaming a key tactic.[citation needed] Variants of the Formula Vee rules exist in Australia, Brazil, Canada, Germany, the UK & Ireland, South Africa, and New Zealand.[citation needed] (Formula Super Vee, although initially similar, soon moved to water-cooled 1.6-litre (98 cu in) VW four-cylinder engines for higher-tech and faster cars).