| BBK Performance Underdrive Pulley Kits are designed as a direct bolt-on replacement for the current factory pulleys and retain full cooling and charging characteristics. BBK Performance underdrive Mustang pulley kits are one of the easiest ways to free up an average of 8-10 horsepower in under 30 minutes. Each kit comes with complete installation instructions and retains the use of the stock length serpentine belt.
Features:
Add 8-10 horsepower in minutes with this simple bolt-on
Lightweight billet-aluminum construction
Retains proper cooling and charging
Uses factory-length belt | 
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