I've not heard it going fast but it's almost identical to loose guibo bolts. Have you looked at guibo/s?

My customer 328xi would make almost the exact sound in forward when creeping (eg drive through). It would even only some of the time do it.

I had to change his TC and when I did I torqued the bolts and vaporized the clicks.

His car the guibo goes to back but yours should be in front.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)