Underdrive pulley
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 are they worth it and where could i get 1 from ? thanks 
 
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 http://www.uk-mx3.com//forum/viewtopic.php?p=7635#7635 Link to buy is at the end. Read the link at the start and decide if it's worth it for you. 
 
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 No. They are not hamonically damped like the original, I'd put it nowhere near any of my engines. 
 
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 Unless you have your rotating assembly balanced they have the potential to damage your engine. Having said that I put 10,000 miles with one on my K8 engine, with no apparent consequence. I don't have one on my ZE though, because I value the engine more. 
 
