If I had ms paint I would try to circle some stuff for you.
The oil catch can is T’d into both the PCV system and the crank case. That is sending boost where it shouldn’t be. STi’s need a dual can setup.
The oil catch can has a breather filter on it when everything should be leak free on a turbo car.
I have no idea what that red wire is on the right side of the car. It appears to be twisted together and then wrapped with tape. It also looks to be going into the fuse box. :ohnoes
I have no idea what that white hose is that goes across the engine bay (meth?)
I guess the battery was relocated and I don’t know what’s in it’s place besides the external reservoir for the JRZ’s (more meth stuff?)
It doesn’t look like any Subaru engine bay I’ve ever seen. There is weird stuff going on there.