Originally Posted by MakkkD
So I gather Bilsteins/Pro-kit seems to be the way to go?
The Pro system is Eibach's spring with matching strut. This does not fit the XI/XDrive cars.
You can only get the Eibach springs (the ones made for the 335i) with separate struts (Koni yellows/Blistein, etc).
I myself got Eibach springs with Koni yellow and love them.