Quote:
Originally posted by guywithastang
they are the accessory belt pulleys. They are smaller and make it less work for the engine to spin the alt. and a/c and those things. You will need to get a shorter belt and I dont know if it comes in the set. you should get a few extra horses wit the pulleys
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Eh, wouldn't you need a longer belt since the pulleys are actually bigger?
Since the pulleys are bigger in diameter, every revolution spins the accessory less times, creating the underdrive effect. They are also lighter than stock. Anyway, the AEM set comes with belts, so no worries there.
Kyle, do a search on pulleys, they've been talked about now and then.