I was quoted $1,600.00 from a Jacksonville Fla BMW stealer, I mean dealer. I have not replaced it yet because I can't even feel a difference ? I spent close to $2,000.00 grand repalce the front air struts, air compressor and control modual then they tell me I need to replace the aux fan???? I will take it to an Idny if the aux needs to be changed one day?