hi i got a 2000 spec impreza . the trouble im having is that the car wont boost past 0.6 bar , i have a new knock sensor and a new air flow meter fittied to the car . the ecu has no fault codes showing now . ive taken the pipe of the actuator and it will boost up to full boost with out any trouble . ive been told that it sounds like the spring in the actuator is going weak and preventing it from getting any higher , can any give more advice on the problem plz