@Technikhaus Did you ever have any luck, i'm at exactly the same point, hardware installed, verified conectivity back to ecu, free ssm says its setup, but still no CC
https://u.pcloud.link/publink/show?code=kZxKxr7ZQyYuh3GXAOFsYfAgPy2WYffoLwL7
Have a dig through here, i have a heap of manuals in here, try to remember to add any that I come across
I seem to recall, at least for the wagon, the main difference between a standard gtb and the "s line" was that the later had full black interior trim and headliner
I bike to work every day (or work from home) and only drive to the gym once or twice a week (have a setup at home as well). Weekends I'll drive a bit more.
Previously i'd fill up a full tank every 5-6 weeks. Now i'm topping up most weekends. Put ~7l in on Sunday - saves having a $200+ hit every month or so
Pickapart would be worth a shot - have lots of Subarus on the yard currently - https://www.pickapart.co.nz/eziparts/Display_Vehicles.asp?MakeID=37&SeriesID=0&LocationID=7&VehicleDesc=Subaru
These are some of the things I did on my rev D (2001), your's looks like its an early rev C or late rev B
Hose 10 mod
rear sway bar
redo vac lines
re plumb BBOD
relocate boost solenoid
lower it (see if you can find some sti springs)
sti bucket seats
genome muffler (I also had some z/s dps, didn't make much difference)
re do silicon elbows under intercooler
clear side repeaters
fiddle with the ECV rod
Off the top of my head, a basic service for my old 2001 legacy was ~$200 haven't taken the GRB for a service yet so unsure if that cost will change (unlikely) for newer cars. Of course additional work like dif/gearbox oil, coolant will cost more.
One thing that they've caught me out on (up sold) is topping up washer fluid... i always make sure its overflowing when I take it in
I had a decatted (2-2.5"?) zerosport dp on my legacy for a bit - didn't notice any boost spikes, in fact, didn't really notice much difference other than a bit more noise and carbon/soot/tar build up on the bumper above the exhaust. I've sure if it was tuned you could get more out of it
Also if i recall correctly, the cat is only on the secondary turbo - the primary dp doesnt have one
Rev D is tunable, Revs A/B/C arent. Pretty sure the RevD switch over was early 2001.
Your Fuji Heavy Industry tag in the engine way will say BH5* where * is A,B,C or D
My shameless link to the Subaru stuff I hold - https://u.pcloud.link/publink/show?code=kZxKxr7ZQyYuh3GXAOFsYfAgPy2WYffoLwL7
Full Service Manuals (FSM) for most models pre early 2010s
Are you 100% certain its oil temp? I've got what sounds like the same gauges and its air temp (i ran it as intake temp). from memory the gauges goes from -30 to ~50c
The registration thing is weird. Mine is registered simply as a Legacy. I've seen other GTBs registered as 'GTB', 'Etune' and 'Twin Turbo' Legacy. Who knows if that has an effect on insurance or not
My cousin had a rover with a stuck thermostat so he just shoved an old sweatshirt in front of half the radiator. kept the temp up for the few years before he sold it.
(not suggesting you do this at all)