Whine was getting really bad there for a while. Moving the DICE HD itself around didn't help at all. Went into the back side panel where the wires are connected and noticed the cable and the connectors where next to and partially wrapped around another bundle of wires that was in there. Moved the DICE cable away from the wire bundle and whine is gone! Didn't need to use a ground loop isolator but I store bungee cord and jumper cables in this back area too so chances are I might accidentally move those cables back together so I might put one in there anyway.

I think that you might be able to get some whine relief by moving around the cables in other areas, but the back panel area seems to be the most critical.

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2002 X5 3.0
Sports Package
DICE HD