Check out this site.... (click on any of the items)
http://www.kalecoauto.com/ Here's an example....
Extra Strength Muffler Bearing-
Do you have an annoying rattling in your mufflers? Are they sagging a little? Don't quite sound right? That could be the symptoms of a worn muffler bearing. Allow me to introduce the KaleCo muffler bearing! It's unique iron-graphite composite with pre-grease-packed assembly provides over 200,000 miles of smooth muffler operation! It is most likely they will outlast your mufflers. Also works well on heavy duty exhaust systems. One per muffler.
(and yes, it's a joke...) :rolleyes: