Adding to Crowz input that I agree with--several years ago I upgraded all the speakers and replaced OE subwoofer with an aftermarket unit and amp. I was amazed at the improvement. I read that I could expect the Seicane would improve the sound but I didn't expect it would be much and didn't consider it a reason to buy it. I was extremely surprised at how much better the sound is. Be sure to keep that in mind.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas