Hi people I hope you can help me !!!I bought a bmw 525d bj 2001 with 156.000 km which I liked super. I noticed on the way home on the highway that the car when accelerating slightly whistled during the test drive I heard nothing. I try to describe it exactly to you : Before he whistled slightly and it is somehow always bit louder In, stand gas comes the noise only shortly when I let go of the gas when giving gas in the stand gas you can hardly hear it. But if I don’t hear the noise in which way gas is given, in the lower range you can hear it but easily When speeding up the right one hears it clearly also in the open window you hear it loss of power he doesn’t have, he even pulls super well and continuously. can it be the turbo that goes slow? But why do you hear the noise even in the lower range? Can it damage the particle filter too??