Maybe this is interesting for you guys...
ACS and Eibach are the same springs. ACS is not producing springs by themselves and the papers for both are exactly the same but different Prices. I just ordered Eibach for my F11 its only EUR 120,-- (lowering the car about 25-30mm)
They are sporty but not hard as H&R. btw. H&R and Hartge are also the same springs
They will bring your car down 35mm