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So after 1k miles I've noticed this too.
It's definitely not something coming from the exhaust, almost like a rock hitting the undercarriage under the trunk. It only happens at lower speed, when slowing down or driving in a parking lot.
This is my 5th bmw either M or with a m perf exhaust and I know what a burble, pop, etc sounds like coming from exhaust.
Has anyone asked their service rep about this?
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