if you think you can just turn a pulley out of titanium and bolt it up, then you really need to take a look at the original pulley....there's more to it than that....I have the shims and was to ship one out to autowerks, but didn't get the info from them as where, and to who would recieve it...as I do want it returned. I only used one shim on both cars...and could have really not used any...the pulley has to disengage so it isn't just a pulley...and the surface of the pulley that engages against the supercharger face isn't metal either....