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pulleys are for faster revs up and down.. you are thinking flywheels... pulleys are for less parasitic losses to alternators and ac systems and things like that...
personaly i don't see it as a wise upgrade and wouldn't do it if i had the chance (and didn't)
they won't harm the engine but the electronics will pull the energy and from a lower charge system thus leaving less for spark and such and that's never good. also the accessories are set to spin at a specific speed so changing that will take them outta spec.
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