Underdriven Billet Water Pump Pulley for Fiesta ST 1.6L Ecoboost

Underdriven by 8% to prevent pump cavitation. Water pump spins slower than with stock pulley, allowing a higher redline without coolant aeration. Upgraded radiator is recommended!

Due to additional pulley size, Gates K060620 Belt is the recommended longer belt.

Weighs in at 6.9 oz (nice)