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Originally Posted by dwagenseller
That's what I was thinking. Correct me if I'm wrong but aren't the shocks air regulated and not hydraulic?
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On the 4.4i, only the Sport package has air front and back. The non-Sport has air in the back only and steel coils in the front. At least that's the case for 2006 E53 models. Check out middle of page 7 on this doc:
http://www.xoutpost.com/pdf/2006%20BM...%20Details.pdf
Also, I'm impressed that you've gotten your X to 150 K. That's re-assuring for me as my 4.4 continues to rack up big-time miles. Are you the original owner? I agree with Wagner, if you've never changed out the shocks, now might be the time to bite the bullet and do it.