you have a check engine light? A bad sensor(MAF sensor, Exhaust temp Sensor, Coolant temp sensor) could trigger boost fluctuations. Any small leaks could do the same as well. A bad N75 valve? I take it the 007 is the diverter so that's ok. Just trying to list some of the usualls. I have a VAG. If you're in the New Tampa area i'd be happy to check for codes for you.