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Message: <blockquote data-quote="leforte" data-source="post: 348576" data-attributes="member: 1943">you may want to stay far away from this. FYI a crank pulley is apart of the rotating assembly of the engine and its also fitted with a harmonic damper to dampened the resonance emitted by the engine during its operation. most of this if not all after market crank pulley are not balanced and fitted with a harmonic damper. i have seen the one you mentioned, and a piece of rubber insert DOES NOT constitute it as a harmonic damper. its more like a rubber piece for aesthetic use rather than for its functions. they are all just copied versions of the oem unit, lighten and a groove with rubber inserted for looks only. every oem harmonic balancer is a part R&Ded with millions by the car company for each specific engine type. you think a company can just replicate it?Since they are underdriving your accessories, you do get the performance from them as promised but its gonna be at a cost of all your other parts failing or the total lost of your engine. a forumer here has tried it on his car. i've warned him before hand however i was too late as it was already fitted. and guess what.. it took only a few days of use and all hell broke loose with major damage to his oil pump, power steering pump and others costing him a repair cost of a few Ks. my advised to you, is stay far far away from shops that sell this as they are generally clueless about the functions of your car and its only there for profits. its your choice. buy at your own risk. you have been warned. for more info please check out the link below from a reputable tuner on the subject. <a href="http://www.dinancars.com/bmw/technial-info/the-dangers-of-power-pulleys-and-understanding-the-harmonic-damper" target="_blank">http://www.dinancars.com/bmw/technial-info/the-dangers-of-power-pulleys-and-understanding-the-harmonic-damper</a></blockquote>

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