BMW makes a height adjustable kit, AutoID used to list it but I see its not there anymore apparently if you have BMW install it your suspension warranty is in tact. It was like 1800 though plus cost to install at a dealer would assume atleast another 600+. So you would have to see if that cost outweighs just buying $250 springs and the chance that 20-30k down the road you have to replace the shocks.
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