First parts to to are the control arms and tension struts. They have varied level of kits at fcpero.com. Back and front. It wouldn't replace shock unless it's showing age. Our X5s are both about 190,000mi original shock still performing ok. The anti sway links should have failed long ago.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)