You are very wrong haha. First of all, there are outbacks for the impreza and the legacy which are quite different. Also, there is a difference in the engines and many other things depending on if you have a 2.0, 2.5 or 3.0.
I made a mistake on your engine Uni-corn, it is actually an ej25 not an ej20. However, I think that it should still be a pretty simple change if you can't find the exact instructions. Try looking at up 2.5l forester, impreza rs and other outbacks for instructions, those should all be the same.