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I've noticed that BMW are now too miserable to put sound deadening insulation under the rear speaker shelf. Probably because you don't notice it's not there unless you are a contortionist.
I'm pretty sure all my past BMW sedans have had insulation fitted under the shelf.
But I do have insulation under the bonnet...seems that only comes with the 2 extra cylinders in the M340i and doesn't come with 320 or 330
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