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Upgraded audio
Ive seen one brouchure that said it was a HK, but one brochure also said floormats are standard, tilt down mirror. To answer your question, the upgraded carver is much better than the HK upgrade in a 3-series (ive had 5). Subs behind seats, directional mounted tweeters at the side mirror level
Ive upgraded the stereo in almost all my cars before (spending $2k-$3k), I wont be doing anything to the Z4, very good IMO
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