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Wow, that sounds like shit.
I've had a tensioner fail on me before on previous cars, completely locked up, and it didnt sound anywhere near that bad. It's definitely mechanical. Hopefully its wastegate flutter or something relatively cheap to repair.
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2020 M550 / Dark Graphite / Napa Saddle Brown / DHP Pkg / Exec Pkg / Luxury Pkg / Parking Asst Pkg
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