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That part is a rubber resonator ans only weighs about a couple ounces. It is there to keep teh car from shaking at idle. I wouldn't remove it.
No, he's talking about a big black metal bar, which I think is part of the bumper/crash impact system (that they may have made extra beefy for the weight balance).
I know that AndyM had a subscription to BMWTIS and could not find any part number that looked like ballast in the rear, and I have a hunch that it's not a separate piece, but rather a heftier than needed part that is functioning as something else...
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