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I had the same issue. Stock car, 2011 N55 with 44,000KM on it.
Made some noises on cold start and when revs came down. I took it to dealer and they replaced my turbo under warranty at 50,000KM. After wards, the SA said that some wastegate rattle is normal on the N55. I hear it a bit now again after i added JB4, but very very minimal compared to before. You should be fine.
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