Stock Rims...??? (centric rings) --- Struts.... I had the same prob and it was my struts that was shot, do you hear clanking sounds when you take a bump. I have 186K on my 4.4 and heard and had it all.

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E53 Titaniun/Grey 4.4i - Sold
E70 Black/Black - 4.8i - Sold
F07 SpaceGrey/Black 4.4i Twin Turbo - Current
X5 & GT is the Ultimate Driving Machine