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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The AEM intake system is a performance product that can be used safely during mild weather conditions. During harsh and inclement weather conditions, you must return your vehicle to stock OEM air box and intake tract configuration. Failure to follow these instructions will void your warranty.
1. 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. Disconnect negative battery terminal.
e. Do not discard stock components after removal of the factory system.
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Installation
(1) Disconnect the vacuum hose, recirculation hose and remove the factory air bypass valve.
(2) Mount the GReddy Blow Off Valve on to the supplied adaptor using the provided gasket and hardware
(3) Remove the rubber sleeve off from the factory bypass valve and install it on to the GReddy Blow off valve adaptor.
Venting out to atmosphere Type
(1) Remover the plastic pipe out of the factory suction pipe and install the provided aluminum plug with factory hose clamp.
(2) Install the GReddy Blow Off Valve as shown using the factory hose clamps.
(3) Reconnect the vacuum using the factory hose clamps.
(4) Stick the emblem to the top housing.
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Removal
1. Remove the air cleaner outlet tube.
- Remove the hoses.
- Loosen the clamps.
- Remove the air cleaner outlet tube.
2. Remove the pin-type retainers and the accelerator cable splash shield.
3. Disconnect the throttle cable and the cruise control cable.
4. Disconnect the Throttle Position Sensor (TPS) and Idle Air Control (IAC)
valve electrical connectors.
5. Disconnect the harness from the throttle body stud.
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This article contains underhood views or schematics of vacuum hose routing. Use these vacuum diagrams during the visual inspection in F – BASIC TESTING. This will assist in identifying improperly routed vacuum hoses which cause driveability and/or computer-indicated malfunctions.
1991 ENGINE PERFORMANCE Vacuum Diagrams Camry, Celica, Corolla, Cressida, Land Cruiser, MR2, Pickup, Previa, Supra, Tercel, 4Runner.
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Removal of Factory Intake
1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable.
2. Disconnect the mass air sensor electrical connection.
3. Depress the center pins on the push clips on the radiator core support cover.
4. Remove the radiator core support cover.
5. Unclip the relay and fuse box and move out the way.
6. Loosen and remove the bolt on the radiator core support.
7. Unclip the PWM vacuum switching valve from the air cleaner assembly.
8. Pull to remove the computer fresh air tube.
9. Loosen the clamps on the stock intake tube, then remove the stock intake tube.
10. Remove the two stock rubber hoses from the air cleaner lid.
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This performance kit installation steps on Audi A3: 1. Disconnect the negative terminal from the vehicle battery. 2. Remove the plastic engine cover. (Fig. 1) 3. Unclip & remove the engine breather hose from the intake pipe. (Fig. 2) 4. Remove the small vacuum hose from under the breather hose on the intake pipe. Follow the vacuum hose & remove the hose from the inlet manifold. Blank off the pipe on the manifold using the small rubber cap supplied. (Fig. 3) 5. Remove the small rubber hose from the side of the intake pipe as shown. (Fig. 4) 6. Unclip & remove the auxiliary air pump feed pipe from the air box as shown. (Fig. 5) 7. Unclip & remove the plastic intake pipe from the throttle housing. (Fig. 6) 8. Remove the air box securing bolt & carefully pull the air box assembly out of its mounting grommets. Remove the air box (more…)

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The intake manifold assembly is a two-piece design. The upper portion is made from a composite material and the lower portion
is cast-aluminum. The throttle body attaches to the upper manifold. The lower manifold has an Exhaust Gas Recirculation (EGR)
port cast into the manifold for mixture of exhaust gases with the fuel and air mixture. The EGR valve bolts into the lower intake
manifold.
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Removal 1. Remove the intake manifold cover. 2. Disconnect the intake air temperature (IAT) sensor 2 connector (A), and remove the breather pipe (B), then remove the intake air duct (C). 3. Remove the positive crankcase ventilation (PCV) hose (A), brake booster vacuum hose (B), vacuum hose (C) and vacuum line mounting bolts (D). 4. Remove the evaporative emission (EVAP) canister hose (A) and the transmission breather hose clamp bracket (B). 5. Remove and plug the water bypass hoses (C). 6. Remove the engine wire harness connectors and wire harness clamps from the intake manifold. – Intake air temperature (IAT) sensor 1 connector – Throttle actuator connector – Manifold absolute pressure (MAP) sensor connector – Evaporative emission (EVAP) canister purge valve connector – Intake manifold tuning (IMT) (intake manifold runner control (IMRC)) actuator connector
7. Remove the upper cover mounting bolts and nuts sequentially in two or three steps, then remove the upper cover. 8. Remove the intake manifold mounting bolts and nuts sequentially in two or three steps, then remove the intake manifold and spacer.
Installation
1. Install the gasket and spacer on the injector base. 2. Install the intake manifold. Tighten the bolts and nuts sequentially in two or three steps. Always use a new intake manifold gasket. 3. Install the upper cover. Tighten the bolts and nuts sequentially in two or three steps. Always use a new gasket. 4. Install the engine wire harness connectors and wire harness clamps from the intake manifold.

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Bob and I appreciate your purchase of your HyperBoost Valves from Stratmosphere. Please read these instructions prior to installation so that you can enjoy a simple and quick installation of your new HyperBoost valves!

Step 1- Remove motor cover
This is the small triangular cover in the front of the engine where the dipstick is located (figure 1). Just twist the two screws 90 degrees counterclockwise. Then lift up the cover. The cover fits onto a rubber round mount at the point on the “triangle” as well. It’s just pressed on there.
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