The suspension on the 4.6 is fairly stiff to begin with but I noticed the front is especially hard. The added complexity is that that 4.6 uses an air suspension as well. I did notice that I hear a "psst" frrom the front when I go over a speed bump slowly. I dont hear this from the rear. Thanks for the info.

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2012 X5 50i & 2003 X5 4.6