OK, power cut is back...
I parked the car for the most part in the fall (windshield wipers weren't working at the time) and only pulled her out to shake off the dust a few weeks ago.
Nothing has changed with the engine that I'm aware of (Did install the STI high-pressure rad cap), but I'm still getting the same "slam into a brick wall" feeling during WOT pulls. I had a passenger confirm via my ECUDataScan that my "high boost" setting is 13.4 psi (stock is 14), so it's not cutting out due to high boost. When in the "low boost" setting (~ 10 psi) I can do WOT pulls all day long without issue.
Things I've replaced:
New Samco inlet hoses
New OEM MAF
New OEM o2 sensor
New spark plugs gapped to 0.028
Used USDM STI coil packs
New Walbro fuel pump
New OEM fuel filter
Any ideas on what I should tackle next? I found the part number for the barometric pressure sensor, it is still available, but is pretty damned expensive. Not that I have much choice right now