BBK · New
BBK 02-04 Mustang 4.6 GT Underdrive Pulley Kit - Lightweight CNC Billet Aluminum (3pc)
MPN 1559 · Store SKU bbk1559
Supplier stock checked 11/7/2026, 4:21:25 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
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 improvements can be seen by reducing the weight of the pulley versus the original pulley which is why we recommend the BBK CNC Machined billet aluminum pulley kits for maximum horsepower gains. ALL BBK pulley kits are designed as direct bolt on replacements for the current factory pulleys and retain full cooling and charging characteristics. BBK under drive pulley kits are vehicle specific and each kit comes with complete installation instructions and allow the re-use of existing serpentine belts. Power-Plus Series® Underdrive Pulley System; CNC Machined Billet Alum.; 3 Piece Kit; Incl. Crank/Water Pump/Alternator Pulleys/All Req. Hardware; For Long Style Water Pump; 2001-2004 MUSTANG GT/00-01 COBRA 3 PC PERFORMANCE UNDER DRIVE PULLEY KIT (BILLET ALUMINUM) 2001-2004 MUSTANG GT/00-01 COBRA 3 PC UNDER DRIVE PULLEY KIT (BILLET ALUMINUM) Power-Plus Series® Underdrive Pulley System
Manufacturer fitment & guides
Check 1559 against the manufacturer’s application information below.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- California Proposition 65: Y
