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Fitment and Product Information: Billet Aluminum Underdrive Pulley Kit For 1997-2004 Ford F Series Truck Product Details: Brand: BBKPart Number: 15550 Product Features and Description: Install a set of BBK performance underdrive pulleys and see an average of 8-15 additional horsepower over the stock pulleys. Under drive pulleys increase engine output by reducing the draw of the engines accessories by slowing them down and reducing the HP they use. Additional and significant performance improveme...

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