Set of UPR SFI Underdrive Pulleys for all 2005-2010 GT Mustangs.Get back the power you deserve from your power robbing accessories with UPR's all new SFI Rated Underdrive Pulley Set for your 2005-2010 4.6L GT Mustang. Includes both the SFI 18.1 rated crank pulley and gun drilled water pump pulley. Gains of up to 12 RWHP has been seen with these pulley.
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