Re: SR20 bogging under boost
Double check your intercooler piping. Then check it again.
Download the SR FSM and test the MAF per the instructions. Just because the car nearly dies when you unplug it doesn't mean it's 100%.
I drove my SR with an MAF that was gradually going bad for a long time, and I didn't know it until it got really bad. Replaced it and it felt like a brand new car.
Test the MAF first.