i used to be with the suby community and what people used to do with the wrx's and rs's to convert to rwd (mainly for drifting) was to weld up the center diff and then plug up the front cv's. there was also a japanese company that made a kit to do it but i can't remember who they were exactly. just search the suby forums (i-club.com, nasioc.com, or rs25.com).