I was chasing this problem a year ago and gave up. I used to feel a big pull at 3200+ rpm but it slowly went away. at first it was intermittent, and through the boost curve i could feel it drop off sporadically almost as if it were missing but nothing indicates a misfire, no codes or anything. It still seems pretty powerful for a 2.0 so I'm pretty sure the turbo is working fine. I had the intake apart and checked the hoses, didn't find any cracks or anything. I did find a crack in the vacuum line that goes from the intake to the wastegate solenoid and excitedly replace all the vacuum lines in that system making sure to keep the restriction bead where it goes, but it didnt fix the problem. I know there's pressure in the system because I loosened the BOV bolts to see if there was a power drop and could hear the air being forced through the loosened fitting. I dont have any other way to check the pressure. any suggestions? could the BOV be stuck open?