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2003 Ford Focus L4-2.0L DryFlow Filter Part Number 21-450 Installation Instructions

March 8th, 2010 · No Comments

Preparing Vehicle
a. Make sure vehicle is parked on level surface.
b. Set parking brake.
c. If engine has run in the past two hours, let it cool down.
d. Remove the battery cover and disconnect negative battery terminal.
e. Do not discard stock components after removal of the factory system.

2. Removal of stock system
a. Loosen the hose clamps attaching the primary stock intake pipe to the throttle body and the primary stock intake pipe to the mass air flow sensor.
i. Remove the primary stock intake pipe.
b. Disconnect the wiring harness from the mass air flow sensor.
c. Remove the mass air flow sensor from the stock intake piping using the supplied torx tool and set aside as it will be used in the installation of the AEM® intake. Be careful not to damage the mass air flow sensor.
d. Remove the breather hose from the valve cover to the air cleaner housing.
e. Remove the air cleaner housing from the vehicle. This is done by pulling straight up on the housing. There are no bolts holding the housing in.
f. Unfasten the battery by removing the battery strap.
g. Carefully lift the battery out of the car and place in a safe place.
h. Remove the battery tray.
i. NOTE: Be sure to disconnect any harnesses that may be attached to the tray.
i. Remove the two plastic hold downs from the secondary intake tube.
j. Remove the secondary intake tube from the engine mount by lifting straight up.
k. Remove the secondary intake tube through the front of the vehicle.

Installation of AEM® intake system.
a. When installing the intake system, do not completely tighten the hose clamps or mounting hardware until instructed to do so.
b. On page 8 of the instructions are pictures of the AEM® intake system installed on the Ford Focus to help assist with the installation process.
c. Install the mass air flow sensor on the AEM® intake piping using the factory bolts.
d. Install the large end of the 90° reducer hose onto the throttle body.
i. Install the supplied 3.5” and 2.75” hose clamps over the respective sections of the 90° reducer hose.
e. Remove the 10mm bolt from the distributor coil pack bracket and install a rubber soft mount.
i. If your vehicle has an automatic transmission, then use one of the 1” long rubber mounts.
ii. If your vehicle has a manual transmission, then use the 5/8” long rubber mount.


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