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Just like the well proven Evo 8/9 water pump under drive pulley The Evo X under drive water pump pulley is meant to slow down the water pump without effecting any type of performance. In slowing down the Water pump we have effectively reduced coolant cavitations in the cooling system, less stress on the rotating mass/assembly do to less resistance during high RPM, and reduced coolant pressure at high RPM while maintaining AND improving coolant temps. These allow the coolant to pass threw the radiator at a slower speed increasing efficiency in cooling time before entering back into the block. These are lighter then OEM, and come with titanium mounting bolts and a new serpentine belt.
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