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a smaller crank pulley slows everything down, since the belt travels a shorter distance in the same amount of time compared to a bigger pulley at the same rpm. a smaller water pump pulley speeds up the pump in relation to the crank, thus negating any power gains you might have found. but i guess the AC and PS pumps are still turning a little slower, thus freeing up a little of the 2 or 3 hp they soak up when the AC is off and the steering isn't being turned.
in the end, you gain a miniscule amount of power due to the lower mass of the pulleys and accessories turning a few less rpm..
i'd rather spend the $250 on something that might actually make the car faster or more reliable.
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