Is there something in particular that makes you think it is not a 4.6 capeX5? I don't see anything. Please post pictures of your two 4.6s. Would love to see them. Got any that show them side by side, would be a great picture. I don't see anything warranting a mic drop unless you mean having two 4.6s is the reason.

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