Originally Posted by SDV325
Changing out the swaybars and endlinks are usually the first step in tuning AWD suspension (well technically tires first). You will greatly benefit more from having stiffer swaybars/bushings prior to doing springs/shocks.
Coming from the Subaru scene this is quite common and companies like whiteline have a very good reputation and parts selection. Was quite surprised on how many BMW parts were made as well.
Unfortunately, such is not true with the bmw due to the complexity of swapping out the rear sway and needing to drop the subframe.