well that is what i thought also but i wasnt sure. It sounded like the MAP sensor fooler would only remove the overboost light from comming on and im not having that problem becuase i can even get to 25psi. Wouldnt removing the boost line to the MAP sensor test that theory and alow the motor to get max boost? I tried that to and it didn't work. So are you think the actual wiring harness that plugs into the MAP sensor or a relief valve?