Hello, I just registered here, maybe someone here has an idea what it is about. My Volvo contract workshop seems to have no shimmer. I’ll tell you briefly. At first it fell only slightly on the noise. I thought of a leaf in the ventilation or something. Then I noticed that this chirping, fieping .. can be heard at light gas-giving, but only at slow to moderate speeds up to muchl. Max 80 km/h. From the outside one hears it more than from the inside. So ADAC on advised by volvo (should press on call) is called up.. nothing read out, nothing found… by the way, no inspection was found at the volvo. So off to the workshop. So get a call, it would probably lie with high probability at a defective kat, I would have to reckon with costs of approx. 4000€. Good. or better not well changed. Thanks was still there today. Noise is still there, but the kat was changed, there is a crack at the ceramic part of the tube.