Thanks. Looks like red and blue are L+R positive and brown is common ground. You could wrap a few ferrite core magnets around the cable and do the same thing as the filter (a small capacitor across the leads would work as well), effectively making this cable for about $2.50, but as far as pre made goes this is pretty much it as far as I can see. Least it is available to the market I suppose.

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~2003 X5 4.4i~