Hey guys,
I've finished an upgrade on my car to swap out most of steel heim joints for Spohn Performance Del-Sphere Pivot Joints. It uses a mono-ball with Delrin liners. It really lowers the NVH associated with steel heim joints, without giving up the accuracy. Plus they are rebuildable and greasable. Good stuff.
I've got some pics up over on PT:
http://www.pro-touring.com/forum/showthread.php?t=57998
jp