Cookiemonster

Hey guys Looking at getting my first subaru, I've have a mk4 1.8t golf at the moment, so completely new to the boxer engine, and the whole subaru thing, I'm looking at getting a blobeye Sti unless you guys point me in different directions Just wondering what's I should be looking out for eg common faults, signs of misuse/ engine abuse What are common mods/ improvements should I be looking at aswell? Thanks in advance Harry