Ok back to this one, today i stripped all of the boost and vacuum pipes and checked for leaks, no leaks, i tried a friends AMAL valve, i then put on a new wastegate actuator and none of it has made any difference, it still overboosts but if i unplug the AMAL valve then i just get wastegate pressure. I'm really stumped on this, is there anything on the inlet side i can check, any sensors, pipes etc? Or could i just have been unlucky and my friends amal vale is goosed too, his car is modified so he expects the kind of boost i'm getting but it was a standard valve.

John