Dinan has just come up with swaybars for the E39 M5. They cost in the region of $500. I took some pictures of the swaybar for those of you who are interested. It looks pretty cool having the Dinan engraved in the center and carbon fiber trim on the sides.
<a href="http://www.bmwregistry.com">Dinan Swaybars</a>
<a href="http://www.bmwregistry.com">Dinan Swaybars</a>