Haha thanks for the input. Thats a cash price! I noticed that on the Arnott Springs which is what raised my suspicions on everything else. Other then the air springs everything else is OEM BMW parts. I was always under the impression that changing the air springs was easy as well but I guess maybe with Calibration in mind it might be correct.

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Current
2006 BMW X5 4.8is Dinan S2 Black on Black

Retired
2004 BMW X5 4.8is Black on Cream
2001 Bmw X5 3.0
2006 Bmw 530i
1996 Bmw 328is
1994 Toyota Landcruiser
1989 Bmw 535i