I have had both the Eibach sway bars and the H&R lowering kit in place for several years. The sway bars are the single greatest improvement in handling. I didn't use the H&R links I found some more adjustable links somewhere, maybe Ebay. The H&R links are fine, I just wanted to lower the rear a little more.

If you want to get the most out of the sway bars and improve the handling even further, consider camber plates, strut tower brace and wheel spacers. I tried Bilstein heavy duty struts but they made my X very skittish so I went back to stock on both ends.

Wheels spacers help handling and help fill the wheel wells. If you add spacers, I suggest that you purchase the type that are secured to the hub and come with longer lug bolts. Some tire shops will not touch wheels unless they are of that type. To decide on the correct width, measure from the widest point of the tire tread to the inner side of your fender. You can go wider but risk throwing trash up the side of your X.

Since you are going to need an alinement after you lower your X, I suggest that if your stock suspension parts are due or will be soon that you do all the mods and stock suspension work at the same time so that you can avoid the cost of several alignments than if you do the work in stages.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas