After I bought my car. I was being cheap and cut out the bottom of the air box, instead of buying an intake. The car started boosting 15lbs. Called Pettit and they talked me into getting there intake, they said they'd send a boost orfice to lower my boost back to 12lbs. So I got the intake put it in, and installed the orfice. Got 5 to 6 lbs of boost. So I took it out and I'm still running 5lbs. It's a steady 5lbs, it doesn't jump. How do I fix this. I don't think it has to do with the intake. I think something it wrong with my waste gate or a vacumm leak, it just happened at the same time I put the intake in. Any idea's??? Not sure if you need this info but, it has Pettit Intake, M2 pulley kit, M2 down pipe, high-flow cat, cat-back, and M2 ecu upgrade. Thanks guys Marcus!

 

Like you said, look for a vacuum leak. Particularly suspect would be those lines connecting the Y to the BOV and POV and those the any intake or air box you might have ... and those valves themselves. I didn't have my POV on long enough to experience it going off, so I'm not exactly sure if it's a once-and-done or if it is reusable, but if it's once-and-done then that's your cause if the others don't check out.

 

is it 5 psi on both turbos, if its jsut on the second turbo it very well could be your cat. i had a high flow on my car and the cat went bad and i could only manage 5 psi on the second.

 

It's funny how I know 2 people that went from seq, to non-seq, and both wanted to go back to seq.

Come on, boost problems are fun to diagnose