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I purchased a 2020 C63s and I have about 4k miles. I have recently noticed this howling noise and I think it is coming from the turbos. It seems to happen near 3800-4000 rpm when i downshift or when I rev the engine. I have taken it to the dealership and they are saying it seems normal but i took it to a mechanic shop and they are saying there may be a problem with the turbo. Let me know what you think I should do.

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