Thank you for your feedback, I'll start looking into the technical stuff behind the EJ25.Hi DMV, your boost/fuel problems seem familiar. My first recommendation is read as much technical stuff as you can about the EJ25 (I read everything technical on nasioc).
Seems like there may be several things happening at once and that makes troubleshooting difficult.
First, how many miles does your car have? A well known problem is the OEM turbo inlet tearing around 100k (mine tore around 120k) and then the car runs lean and boost is all over the place once you pass 0 psi . The problem is you usually can't see the tear. It only becomes visible when you remove the turbo inlet.
Second, have you checked the spark plugs AND are they the correct ones? When I bought my 2006 WRX the last service shop changed the plugs but used the Impreza plug instead of the WRX plug. The difference is significant. The gaps are around 0.040" and 0.025" (don't quote me), but the point is I had several misfires when I went into boost and/or at high RPM.
Third, are you certain you are running an official COBB map? Download the manual and read it. Then restore the official COBB maps on the accessport and choose the one that best matches your setup (probably stage 1 91 oct).
Fourth, do you have enough fuel? Is the fuel pump due for a change/upgrade and has the filter been replaced? If you're planning on keeping the car a while, I would recommend a 255+ lph pump and a steel mesh filter.
Last but not least, I am in Pittsburgh, PA and started an engine building shop last winter.
Good luck with your diagnostics.
Finally running sub 5s 0-60 and 13s in the quarter mile!Update:
I decided that it was most likely a vacuum leak, so me and a friend took apart the intake all the way down to the turbo and put it back together. We found several loose hose clamps, upon putting everything back together nice and tight, the car runs better than ever! However now I'm hitting upwards of 20lbs of boost and will even get a "boost limit exceeded" code if I push it hard in 5th