[GhOsT6_9]

With the used supercharger's you should be ok with them. Just make sure you check for any play in the pulley and turbine, both front to back and side to side. That could give you a sign of whether the bearings are gone or not.

I personally wouldn't buy a used one unless I knew the person, just cuz of the amount of $$ being spent, but thats just me. That and I like having a warranty incase it flies apart or something. Just remember with the used stuff its buyer beware with a tail light warranty.