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Hi
exact same sound on my M135i coming from the bottom right over bumpy roads, like styrofoam rub. I changed the engine mounts and retighten the subframe, and it went away for a while ! for 1 month absolutely quiet ! May be caused by engine rocking. Have that checked. I eliminated suspension because it could happen stationary on the brakes but with slight throttle. My mechanic pried the engine while on a hoist with a bar and it creaked abit. Good luck and pls report back ! Lately its coming back again .. SIGH!
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