We jsut put a APR Stage III turbo upgrad on our car.....at 5,800 in 3rd gear the car drops boost from 15, 18, whatever we have it set at and falls on it's face to 5 lbs. Any ideas on the problem or how to fix it?
Now is this just in third gear? Where did you get it installed? it almost sounds like a wastegate or something is opening up prematurly. I know APTuning (the company that sponsers us) installs and deals with APR STG III so i'm sure one of those guys will chime in soon with something more specific.