This is how an earlier 4.6 looks. As I understand you are thinking of painting some or all of the bumper matt black. A way to see what it looks like would be to use plasti-coat spray. The possibility it will look good is based a lot on the color of your X. Use of black anything tends to look good on white, black and gray as they blend or contrast well.

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