Just got my 2008 E92 M3 its a convertible and what I been noticing is a noise coming from the rear like the diff when I turn all the way to the left or to the right and transmission engaged like a grinding noise at any speed but more noticeable at low. I also get a hollow/slight wine noise coming from rear when at full throttle it towards higher rpms can that be diff or axles. I visually inspected the rear and looks fine. Car only has 23k on it. Any help or any body experience this?
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