Installed new Arnott rear air coils yesterday. Original right rear coil blew out 5 days ago. It took about 3 hours, mostly because I have the rear cargo tray, which is a PITA to remove. Now it is back to normal ride height, and seems to ride better than before.

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"If it ain't broke, fix it 'till it is"
'02 X5 3.0i, build date 02/2002, 135k, stock (for now)