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Belt noise?
Thanks for posting the video. It's the same noise I get. It is easily reproduced under load in my car. The sound is a very quick squeak. Did you ever resolve this? Is it the belt slipping for sure?
I have a Dinan underdrive pulley installed in my E93 DCT. I heard it on the first day but it was hard to reproduce for the installation technician. It has been like that now for over a year and few months. The car still runs great. It's been on the track many times without issue. It almost sounds like a blow-off valve on a turbo car. I have gotten used to it but I would like it gone if that is possible.
Please let me know if you ever found root cause and a cure.
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