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Message: <blockquote data-quote="leforte" data-source="post: 299242" data-attributes="member: 1943">hey bro,installing any lightweight pulleys on the accessories is ok so long as they are not too underdriven that it impedes the tast its supposed to do. they do work with good performance felt. anyway most well made, professionally produce underdrive/lightweight pulleys (eg. like those sold by calvin tan@eurocarmotorsport) only has the power steering unit + a waterpump unit. they are properly engineered with properly calculated reduction in drive to give a good balance of performance and functional reliability. most will not mess with/change  the alternator pulley as its a lifeline for any car electronics. as for the crankpulley, there are indeed some in the market that has rubber dampers in them. some functional as designed, but most are just for show as its just a tiny piece of rubber inserted into a groove in the pulley ie those made by mytheological.. and Even for those that have the right designs, they may just cause other issues as they may not be the proper weight to balanced the engine as the original bmw unit. just imagine a wheel that is balanced without the proper lead weights, it will still vibrate at a certain degree.... so this is the reason why most tuner would not be bothered with a crankpulley as its already adequate for its tast.</blockquote>