FWIW if you have the basic system without idrive and all that kit sitting unused, I'd definitely do that. The earthquakes are supposed to be excellent, but there are other 8" shallow mount subs out there too.
Rather than stick a sub in the ski hatch, I'd upgrade all the factory speakers with what you've got and keep your boot free and looking OEM.
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Just how many Yorkshire sheep can you fit inside one exhaust?
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