There have been over seven variations of the World RallyCross dating back to the initial Subaru rally staging cars. The Japanese manufacturer adopted the WRX nameplate since all the vehicles in the series feature rally staging technology. WRX stands for World Rally eXperimental. Subaru WRX featured some rally technology such as turbocharged four-cylinder engines, stiffened suspensions, and an all-wheel-drive feature. The STI versions from the manufacturer were marketed and branded with consecutive numbers. STI stands for Subaru Tecnica International.