The BMW E53 X5 drives beautifully with its air suspension system. But after a decade of enduring significant pressure changes daily, the rubber bladder can eventually fail, causing noticable sagging in the rear of the vehicle. It also becomes awful to drive, as well as being potentially very dangerous. We offer these replacements from the best in the industry -- Bilstein. The B3 Airmatic air springs have been designed and tested to last, as well as restoring the ride and handling that the X5 is famous for.