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As important as the belt age - it may not be a Subaru belt, and the lower toothed idler failing. The lower idlers are ubiquitously in poor shape by the age of that car and belt checking oil pressure with a gauge before and after addressing the pump would potentially confirm it was the issue. Good luck! Hope you can knock this out soon!

I’m always cautious on this - the note could be the last time the belt and kit was changed, it could also be the second or third last time too... you just never know when it comes to vehicles that are new to you unless the PO told you truthfully about the last service of these items. Just saying. Cheers Bennie

If she got that hot your HGs might be toast and the alloy softened too. @GeneralDisorder would have more info on this, I suspect it could be time to look into a new engine or an EJ conversion Bennie

well i replaced tank with a brand new one made by spectra premium out of Canada looks great fit perfectly and works outstanding so far . oh yes i found a peace of silicone rubber wrapped around the old fuel tank pick up screen in bottom of tank that was causing a fuel starvation problem and headaches six months of hell. finally she runs great again and revs out no more stalling .bs.

Any 2008+ STI will have the 11mm pump. We use them exclusively on all engine builds. That said - the horse has left the barn so-to-speak. All of the pumps are going to produce about 90 psi on cold start. An EJ engine with good clearances will be about 20 to 25 psi at hot idle. The idiot light comes on at a ridiculously low 4-6 psi. This is a common misconception - oil pumps produce FLOW and the size of the pump dictates VOLUME. PRESSURE is a function of resistance to flow. What you have is a lack of pressure and thus a lack of resistance to flow. In every case I have ever seen this is due to significant wear in the main and rod bearings of the engine. The rod bearings we all know about. The mains get "loose" over time - especially the #2, #3, and #4 mains due to crankshaft deflection and compression of the cast aluminum block. Replacing the pump will not likely do much good for long. You can try. I would also switch to 20w50 on this engine to increase the idle oil pressure. I have seen borderline engines bump up 10-15 psi from thicker oil. Keep it cool and be gentle with it. It may last a few more seasons. GD