Im sure that this has been asked before about the same car, and it wasnt really going to work last time. There are huge issues in doing this to a ej15. ECU, wiring, bottom end strength, overall strength, compression ratio, etc etc. Subarus dont like to be +T (nissan slang) at all. They arent built the same as there turbo counterpart. If you are seriously wanting a turbo impreza, ethier get a turbo motor and rewire it all, or look at getting another car. I know its not the answer that you will want to be hearing