Luxury Details gets my vote on custom sound system. He'd be doing the 9500ci install in my M. I saw the custom system that Matt did on multiple cars, including a Bentley, an E55 AMG wagon that belongs to my friend, a G55 AMG, and an SL600. The quality of workmanship is top notch and pricing is reasonable.
Sound In Motion will be a close second pick.
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kev { divinum est sedate dolorem }
"your friendly neighborhood critical care anesthesiologist"
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