Definitely sounds turbo-related, likely wastegate as mentioned above. Sounds very similar to when the turbo in my 328i went bad. It used to rattle like that when I came to an idle from acceleration, def not when driving.
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2020 M550i (G30) | Carbon Black/Black Nappa | DHP | DAP | Executive | Luxury Seating | Park Asst | Ceramic Controls | Front/Rear Heated Seats | 20" 668M wheels
2021 X3 (G02) | Dark Graphite Metallic/Cognac | Premium | DAP | Front/Rear Heated Seats
Sold/Retired: 2012 328i (F30)
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