sold out quick view Out of stock SPEED PERF6RMANC3 SP63 Keyed Crank Pulley & Gears for Ford Ecoboost - Focus RS/ST / Ecoboost Mustang (1) MSRP: $275.00 The Ford Ecoboost engine rely s on 2 friction washers between the crank pulley and sprocket to help keep the motor in time. This works very well for stock power levels and even mild big turbo setups. Once you reach the 400whp mark, slipping... Out of stock Add to Wish List Add to My Wish List Create New Wish List