I just had my local BMW dealer install a set of Dinan springs on my 550i- M Sport, they don't lower the car as much as the ACS, but they dramatically improve the handling and less floating feel vs. the stock springs. I decided to go with Dinan and have them installed by the dealer for peace of mind. The price for Dinan springs is also way less than ACS, which for some unknown reason ACS charges a lot more for 550i than 535i.
Good luck.
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