Porterfield and Isweep both make pads that address this issue.
I'm not sure which is better. I've heard people who have both say that it's dramatically reduced. I know it's not oem but if it fixes it I could live with it.
My porterfield pads are in the box being installed next week. Will report back because the stock ones on my 21 M5C are just WAY too loud to live with.
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