Well from the consensus in this thread plus what I have read elsewhere the rear air is a keeper. Since I will tow with this one no matter what else it needs after I change both bags I will fix it to keep the rear air suspension.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
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Aftermarket E53 Radio Install