Well, I'll tell you for certain that the factory standard Vitz RS's were either a 1.3 RS or a 1.5 RS. Both were non-turbo. You could however, as a dealer option, opt for either a supercharged or turbocharged version. Both were expensive options, so not many were made.
Therefore, chances are, you'll be VERY, VERY lucky to have bagged a turbo model as they're rare, and therefore expensive...