Loose heat shielding or possibly a failure with the flexible section of the exhaust. BMW will replace the flexible section under warranty but it needs specialist welding to be arranged which can take a couple of weeks.
Mine is going in for 2 days on 26th July to have this done and have the pedal box pivot bushes replaced.
A previous rattle I had was the heat shielding and I suspect this exhaust repair will cure the harsh rattle under throttle I have been getting as well as a tinny sound at idle.
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120d Sport gone and replaced with X1 18d XDrive MSport Auto.
No Xenons but plenty of creature comforts.
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