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I purchased a kit from Bavarian Sound Werks. I don't think they offer anything for a 2003 anymore. I have read about many other routes members have gone that are plug and play as well as custom installations. If you don't get input you need in this thread I suggest starting a thread asking for suggestions. There are subwoofers that will fit behind the hatch where the fuse box is in the back and amps that will mount behind the hatch on the drivers side.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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