These BBK Performance pulley kits are one of the easiest ways to free up an average 8-15 horsepower in under 30 minutes. These BBK pulley kits are designed as direct bolt on replacements for the current factory accessory pulleys and retain full cooling and charging characteristics. Each BBK under drive pulley kit is vehicle specific. They are designed and tested at the BBK headquarters in Southern California for maximum performance. These under drive pulley kits are available in a hand polished aluminum finish or gloss black powder coated steel. Each kit comes with complete installation instructions and allow the use of existing serpentine belts.