When I had my Metco pulleys installed, Joe at Power Tech Performance told me that the isolator in the Eaton superchargers would likely break. We did pictures of the install and he showed me the plastic piece with the spring. So he installed a solid one like the Lingenfelters have. My buddy with 9,000 miles on his just started hearing the rattle an dhis dealer is swapping out the supercharger, no problem.
I've got some of the other pics on my site at
www.ghostriderc5.com