I did this as well, and it was money well spent. 700 bucks after paying a shop to install springs and BMW to reprogram the error message. Rides the same, and no worries about random air system failures or quirks.

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01 X5 4.4 (sold), 99 Toyota Land Cruiser, 08 Ram 1500 Quad cab 4wd 6-Speed Manual, 06 Prius, 12 Camry SE.

"An armed society is a polite society"