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my 2016 428i F36 does not have it, however my 2020 440i F36 does
if i have to guess, i believe it absorbs/dampens vibration coming from within the UCA.
i actually left my right side off because i was having such a time lining up the bolt, running out of daylight and wanted to put everything back together. whatever it is doing is undetectable to me.
i'll try to re-install it someday when i have nothing better to do, lol
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