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AEM 21-702C & 21-702P air intake systems are engineered to add horsepower and reduce restriction
compared to OEM air intakes and they come with a lifetime limited warranty. These AEM
air intakes utilize a large reusable DryFlow air filter. This oil-free filter is durable
and very easy to clean.
AEM 21-702C & 21-702P air intakes fit 2012 Ford Focus models with 2.0 liter engines.
See the AEM catalog or AEMintakes.com for up to date model details. This air intake
system is not legal for highway use in California or other states adopting California emission
standards. Check AEMintakes.com for up-to-date information on emissions legality for specific
parts on specific vehicles.
AEM power testing showed an estimated power gain of 4 horsepower gain at 5200 RPM with
this air intake installed on a 2012 Ford Focus with a 2.0 liter engine. Actual results will
vary depending on the condition of the vehicle, mileage, weather and other variables.
Here�s a comparison of the Focus� sound on the dyno with the stock OEM system verses
AEM�s air intake.
AEM air intakes come with detailed instructions with pictures and diagrams. AEM intakes are
engineered for specific vehicles to product a safe horsepower increase.
1. Preparing Vehicle
Make sure vehicle is parked on level surface.
Set parking brake.
If engine has run in the past two hours, let it cool down.
Disconnect negative battery terminal.
Raise the front of the vehicle with a jack. Refer to your owner�s manual for proper
jack and jack stand placement to properly support vehicle. Support your vehicle using
properly rated jack stands before wheel removal or while working under the vehicle.
Do not discard stock components after removal of the factory system.
2. Removal of stock system
Loosen the hose clamp that secures the intake tube to the throttle body.
Lift up on the red locking clip and unplug the MAF sensor.
Unplug the wire harness clip securing the harness to the MAF sensor bracket.
PCV hose #1 is located at the top of the intake tube. It has a blue colored locking mechanism.
Disconnect it.
PCV hose #2 is located at the top of the intake tube. It has a grey colored locking mechanism.
Disconnect it.
Pull the intake tube off of the throttle body.
Unfasten the rubber air inlet strap securing the air box to the front of the vehicle.
The air box is mounted to 3 rubber grommets, pull the air box up and out to dislodge the
air box from the grommets.
Remove the air box assembly from the vehicle.
Loosen the hose clamp securing the intake tube to the MAF sensor. Remove the intake
tube from the airbox assembly.
Remove the two 8mm bolts that secure the MAF sensor to the air box.
Use a panel popper or flat screw driver to remove the front cover on the bumper. Place
the tool in between the bumper and cover. Use a towel or some masking tape on the bumper
and cover to prevent scratches.
Carefully pop off the cover from the bumper.
From under the car remove the 2 T25 Torx screws.
Remove the plastic clip closest to the wheel.
Remove the plastic clip securing the fender liner to the lower front side of the bumper.
Pull down the corner of the belly pan to gain access to the inner bumper cavity.
3. Installation of AEM Intake System
When installing the intake system, do not completely tighten the hose clamps or mounting
hardware until instructed to do so.
Install the hump hose with a #40 hose clamp on the throttle body side and a #44 hose clamp
on the intake tube side.
Install the upper intake tube.
Align the intake pipe and connect both PCV hoses.
Tighten the #40 hose clamp on the throttle body side of the hump hose.
Tighten the #44 hose clamp on the hump hose on the intake pipe side.
Through the opening exposed from the bumper cover removed in step 2m, loosen the 13mm
nut on the chassis.
Install the coupler onto the middle intake tube and secure it with a #40 hose clamp.
Guide the middle intake tube down into the engine bay so the end with the coupler is
positioned on the lower end.
Mount the intake bracket onto the stud where the 13mm nut was loosened in step 3g. Hand
tighten the 13mm nut to sandwich the intake tube�s bracket between the chassis the 13mm
nut.
Install the 2.75� to 3.25� coupler onto the MAF sensor. Slide a #44 hose clamp and
a #52 hose clamp onto the coupler.
Install the 2.75� to 2.5� coupler onto the bottom side of the MAF sensor. Slide a
#44 hose clamp and a #40 hose clamp onto the coupler.
Mount and secure the bracket to the MAF sensor housing using the provided socket head bolts
and 4mm washers. Tighten the socket head bolts using a 2.5MM allen wrench.
Orient the MAF sensor assembly as shown and attach to the upper and middle intake tubes.
Secure the bracket attached to the MAF sensor housing to the vehicle�s frame using the
provided 10mm bolt and washer.
Slide a #40 hose clamp onto the middle intake tube�s lower coupler.
Attach the AEM air filter onto the lower intake tube using a #44 hose clamp.
Pull the belly pan down to gain access to the inner bumper cavity.
Attach the lower intake tube to the middle intake tube coupler. Orient the intake tubes
and air filter and ensure the entire assembly has adequate clearance.
Reach down into the engine bay and use a box wrench to tighten the 13mm chassis nut to
secure the middle intake tube.
Connect the MAF sensor extension harness to the MAF sensor and engine wiring harness.
Secure the MAF sensor extension harness with the two provided zip ties to prevent the wiring
harness from moving around.
Ensure all hose clamps are tightened and secure.
Reinstall the front cover and belly pan.
4. Reassemble Vehicle
Position the inlet pipes for the best fitment. Be sure that the pipes or any other components
do not contact any part of the vehicle. Tighten the rubber mount, all bolts, and hose clamps.
Check for proper hood clearance. Re-adjust pipes if necessary and re-tighten them.
Inspect the engine bay for any loose tools and check that all fasteners that were moved
or removed are properly tightened.
Reconnect the negative battery terminal and start the engine. Let the vehicle idle for
3 minutes. Perform a final inspection before driving the vehicle.
It will be necessary to check AEM air intakes periodically for realignment, clearance and
tightening of all connections. Failure to follow the above instructions or proper maintenance
may void warranty.
Go to AEMintakes.com to find products, download installation instructions, view dyno charts
showing estimated horsepower gains, and for other product details.