Subaru Legacy Outback STI

[mario36cr]

I have a doubt, I know that there are STI versions of various subaru models the Wrx by example, but I did see some subaru legacy Outback wich carry the emblem of STI, I did see it on older versions of the Outback the line that goes fron the 97 to 99, second generation I think, I did research on the web for some information but did not find anything, can any one tell me if there is a Subaru legacy Outback STI ? and if is not much to ask what is the diference betwen the regular Outback and the Outback STI. For what I konw it will be relate principaly to engine .

I will apreciate any comments.

Thanks

Mario