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This is not based on experience with VR6s. Mine comes from living with generations of Saab engines. If you havent - drastically - increased the rev limit to - say 8000 rpm, or added a supercharger or turbo to boost beyond 1.6 BAR, as long as your rebuild - if you've done one - finely balanced the moving mass of crank, rods and pistons, the basic pulley should be fine. Was there a reason for not refitting the original pully back into place? Did it get destroyed because the nut wouldn't budge? There seem to be a few second hand pulleys on the market - here's one.Corrado 2.9 VR6 Genuine VW Crankshaft Pulley | eBay I cannot see the of a lightened pulley to a road engine. Mk3s seem to have a lighter pulley. Perhaps one of the R32 chappies could chime in here- it seems to me that the R32 pulley fits straight on - looking at the parts spec on paper. Second hand it seems to cost around £60, or £350 ish new.