This kit is designed for Subaru Impreza WRX chassis model GDB, engine EJ20/EF25, year 2002-2005. Please do not attempt to install this kit on other application.
Installation:
(1) Disconnect the blow by hose and remove
the blow by tube off from the intercooler.
(2) Disconnect the Air Bypass Valve hose and remove the valve.
(3) Disconnect the turbo outlet hose and throttle hose and remove the intercooler.
(4) Remove the left blow by hose. Cut the provided 12φ rubber hose to 650mm and install it using the provided three way fitting to the right blow by hose as shown.
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1. Disconnect the negative terminal from the battery.
2. Remove the plastic cover from the air box assembly.
3. Remove the air box feed pipe from between the air box lid & slam panel intake scoop.
4. Unclip & remove the electrical harness plug from the MAS (Mass Air Sensor).
5. Unclip & remove the intake hose from the MAS.
6. Unclip the 3 hoses from the top of the air box assembly.
7. Unbolt & remove the two ignition amplifiers from the top of the air box lid.
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1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Disconnect the air temp. sensor electrical connection.
3. Loosen the hose clamps at the turbo inlet and the airbox outlet as shown.
4. Remove the intake tube from the vehicle as shown.
5. Loosen and remove the 10mm nut that retains the airbox to the vehicle.
6. Remove the complete airbox assembly from the vehicle as shown.
7. Remove the airbox mounting grommet as shown.
8. Install the large “L” bracket onto the heat shield with the provided hardware. NOTE: Do not tighten completely.
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1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Disconnect the air temperature sensor electrical connection.
3. Pull firmly up on the engine cover to remove.
4. Loosen the hose clamps on the air intake tube at the throttle body and air box.
5. Disconnect the crank case vent from the valve cover.
6. Remove the air intake hose and crank case vent from vehicle.
7. Lift firmly up on the air box to remove from the car.
8. Remove the stock air box grommets from the stock air box mounting tray.
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1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Depress the locking tab on the mass air sensor electrical connection, then disconnect the\ mass air sensor electrical connection as shown.
3. Release the locking tab and disconnect the crank case vent tube as shown.
4. Loosen the hose clamp, which secures the intake tube to the throttle body, and release the air box over center clips shown.
5. Remove the air box housing half and intake tube as shown.
6. Remove the three body support brace mounting bolts shown and then remove the support brace from the engine compartment.
NOTE: It will be necessary to unhook the cruise control and wiring harness clips from the body brace.
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1. Turn off the ignition and disconnect the negative battery cable.
2. Depress the locking tab and then disconnect the Mass air sensor electrical connection.
3. Loosen the hose clamp which secures the stock intake tube to the turbo inlet tube.
4. Disconnect the stock intake tube from the turbo inlet tube and then lift the complete stock intake assembly from the vehicle as shown.
NOTE: K&N recommends that customers do not discard factory air intake.
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TO START the Installation:
1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Remove the four 13mm nuts that secure the strut toner brace to vehicle, then remove brace from vehicle.
3. Squeeze the two locking tabs together, then remove the mass air electrical connection as shown.
4. Loosen the hose clamp at the intake plenum and release the two clips that secure the air box lid to vehicle, then remove the upper air box and intake tube as shown.
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1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Disconnect the mass air sensor electrical connection.
3. Remove oil cap, then pull up on engine cover to release from its retainers.
4. Disconnect the crank case vent hose from the intake plenum.
5. Loosen the two hose clamps on the intake plenum, then remove the intake plenum from the vehicle as shown.
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The K&N intake tube installation:
1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Disconnect the mass air sensor electrical connection.
3. Loosen hose clamp at the mass air, then remove the three 10mm bolts that secure air box to vehicle.
4. Remove air box from vehicle as shown.
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Please follow these installation instructions carefully. The K&N Drycharger included in this kit must be installed on the K&N air filter when used with a K&N Typhoon Cold Air Intake System. The K&N Typhoon Intake System is a performance product that can be used safely during mild weather conditions. During hard and inclement weather conditions, you must convert your Cold Air Intake System into a short ram configuration, or return your vehicle to the stock OEM airbox and intake tract configuration. Failure to follow these instructions can void your warranty.
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