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I would advise against lightweight crank pulleys , the stock one is to dampen vibration , adding a lightweight one will let your crank wobble, I suggest buying a "fluidampr" pulley , There expensive but they work. Especially if you like to rev your motor

Some may argue the facts, but I'm going with a fluidampr over lightweight ,,

Edit , some may be using lightweight pulleys without problems , but its not worth it for the performance gains

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Yes you do loose torque at low rpm had billeted pulleys and flywheel on my old gti6 and was a ****** to pull away and the idle was so unstable I couldn't bear it any more so put all the stock ones back on was so much better to drive. Also they can cause premature wear to bearings on the crank

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