This is going to be an info dump / repository of important maintanence or modding info I've found doing stuff on my 2005 Forester XT
Keep in mind, I've gone to 2yrs at an Automotive Trade School, and have 10+ ASE EL certifications, so I generally know a thing or two!
Most of this pertains to most Subaru makes/models from pre-CANBUS era (circa 2008).