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Depending on how loud the noise is, as someone mentioned getrag gearboxes have some "rollover noise" and is quite normal.
If you think the noise is excessive it could be your clutch/flywheel.
130i models were known to have a problem with noisy clutch/flywheel. Mine was replaced under warranty.
One of the symptoms was the rattly noise when turning engine off as you described it.
On my car the noise was the worst with clutch depressed half way and disappearing completely once clutch depressed fully.
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