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So it's not the exhaust valve actuator thing for me. I don't have that noise. It's sounds more like air screeching. It's hard to describe (psss) and it's not a turbo noise which sounds nice. This sounds annoying . It's only when I moderately/aggressively step on it and as it downshifts. I apologize I haven't put a video of the noise as I'm freaking busy with work.
When I spoke to the bmw advisor he seemed confident it's normal (even tho it's an annoying sound).
I'm going to get an oil change soon at my local bmw shop and I'll ask them for their opinion.
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