Hi! I’ve been driving a 9-3 aero for a year and I’m very happy with the car. Unfortunately, strange noises have been noticeable lately. If I push through the car fully, so the accelerator pedal goes through and the turbo goes at full speed, one hears a qietching or a hissing, as if something were slipping through. This noise only arises when the turbo’s charging pressure indicator is full, so at high acceleration and correspondingly high torque. In the workshop I was told that the engine and the Turbo 1a were running. Does anyone have any idea what might be the cause here? Perhaps a problem with the coupling?? Thank you already in advance.