The things is that I replace the bpc and works fine it was slow at work so I have replace the waste gate
So the low boost started then and today I didn't drive my car I drove the wife today for oil change,
get a boost gauge on there - those dash gauges are never the most accurate. You are running a TD04 turbo on a 93+ 9000 I assume which HAD a T25 turbo? Was the software int he ECU updated with the turbo? Was the car originally a LPT car?