I've checked out this thread previously for info - this is one of the better sources of info for this swap so figured i'd join and relay what I have going on...
I have an 05 Forester XT Auto with this ej20x swap (the timing belt has the guide so I assume I have the x version), that i've since rebuilt the EJ20x engine on - when I got the car the EJ20x was already installed and running on the stock ECU that had been "tuned" via AP at some point (or maybe flashed back to stock, but still AP locked), albeit for only around 120 max hp per the initial dyno run.
I'm using the stock USDM ECU and harness with a (new) pro tune via Cobb AP, exhaust AVCS not hooked up. The exhaust AVCS sensors I have removed and capped due to oil leaks. I'm running a VF48 turbo, cobb downpipe, 3 port EBCS and currently making 240whp, conservatively tuned. The engine is slightly lower compression than stock due to the pistons we used in the rebuild, which was not a "go for big power power" rebuild, rather lets get this thing running reliably for years to come at reasonable power levels, while not spending more than the price of another used EJ20x @ 1K or so. My friend/mechanic built rotating assembly, I did everything else, learning a ton along the way (often the hard way). The car runs great, although the low end can be a bit wanting at times but i doubt that's big news to anyone. Current limiting factor for power is fuel per the tuner - i have a DW200 fuel pump but still on stock side feed injectors and i'm in no hurry to do the top feed injector conversion - i'm listening to my tuner on avoiding bigger side feeds.
At the moment just enjoying a 95% sorted car and tackling some other drivetrain stuff recently like bearings now that it's running nicely and reasonably quick once boost kicks in. One day I might chase more power starting with the top feed conversion.
As you can probably tell I'm far from an expert but i have tons of part numbers I used on the rebuild if anyone needs one.
