The alternator's pulley is replaced w/ a different one when you put U/D ones on, therefore slowing down the alternator and reducing it's power output. In addition, same thing goes w/ the water pump. Hence the reason for my comment since as a DD, if your car encounters a lot of rush hour traffic (NY/LA style), the reduced speed on the water pump and AC is not one fun sitting in traffic on a 100° day.
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