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The underdrive pulley reduces wear and tear on the accessory bearings and reduces the possibility of cavitation in the water pump. It is worth it if you plan to race the car and drive at high RPMs for extended periods.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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