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It sounds really similar to when my waste gates failed (2009 Z4 35i). Try revving up to 4000 RPM in neutral and let go of the accelerator, sound should be lot more distinct. I had BMW dealer repair it under SI B01 02 12 service information bulletin last year at zero cost. There are workarounds (JB4 waste gate rattle fix, tightening the arm on the waste gate, and etc.) but I feel like they are temporary solutions.
Additional details on the warranty
8 Years/82,000 miles
Delivery Date: 5/21/09 (confirmed they use delivery date, not production date with BMW USA)
Service Date: 4/12/17
Warranty Expiration Date: 5/21/17
I think your warranty would have expired by now, but it doesn't hurt to ask.
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