BBK 1653 Underdrive Pulley Kit for Ford Mustang 4.6L-3V GT - SFI Approved Crank Pulley - CNC Machined Lightweight Aluminum WP by BBK Performance at Boogaloo Festival. MPN: 1653. Hurry! Limited time offer. Offer valid only while supplies last. BBK SFI Under drive Pulley Kit for Ford Mustang 4.6L-3V GT - 2 Piece features SFI approved performance pulley kits with a SFI approved steel crank damper. It is built from high quality CNC machined aluminum. Each steel BBK kit is designed as a direct bolt on to replace the stock pulleys that rob the engine of horsepower. Each SFI pulley kit is designed specifically for each vehicle. This pulley kit for the 2005-2010 Mustang GT is designed as a 2 piece kit. As with the traditional pulley systems
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