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Strange. I got the lightning adapter and plugged it into the BMW Y-cable (w/ 30-pin plug) and the sound quality is great; same quality as my previous iPhone. Not sure why the OP is having issues. I do have the premium sound system. Maybe that has something to do with it??? Or maybe it has something to do with the iDrive changes since MY2008. Mine is MY2011 (no combox).
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