013-14 Ford Focus ST Removal of Stock System: 1. Remove the engine cover. Figure 1 2. Loosen the hose clamps at the connection of the intake and the flex hose (coming from the air box), the turbocharger, and the clamp joining both halves of the intake. 3. Remove the bolt holding the filter side of the intake to the engine and remove the filter half of the intake. Refer to Figure 1. Figure 2 4. Disconnect the crankcase vent fitting at the valve cover (squeeze to release). Refer to Figure 2. 5.