this is a 1.8 t then,make sure all vac pipes are secured with clips,if they arent they will lose pressure when boosting (they can move at the connection)also check that the intercooler is leak free and again check evary single pipe for any signs of a leak and replace g31 intake pressure sender and also check the plugs and fuel pressure.Under boost refers to vac leak/intake leak most prone is the pipe coming from the turbo to the intercooler and also if your running 200 bhp you must have changed the intercooler to increase air flow cooling as this could be your fault.
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