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I just replaced them on my 550 about two weeks ago. Parts from the dealer were around $100 for OEM charcoal filters and took about 20-25 min. You will need a T20 torx screwdriver or bit. Fairly easy to do. When installing, make sure you put them in correct (there is a direction of airflow arrow on them). I also stuck a the blue BMW airfreshner between the folds of the filter so the whole car smells amazing now )))
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