Instructions for Rotating the Subaru STI Intake Manifold

Parts Needed:

 

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GATES K050340 BELT (1)

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THROTTLE BODY SPACER (1)

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OEM THROTTLE BODY GASKET (2)

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EXTENDED M6 HARDWARE (4)
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Extended M8 Hardware (8)
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Intake Manifold Spacer (2)
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OEM Intake Manifold Gasket (4)		  

 

Step 1

Remove the intercooler, charge piping, upper intake manifold, TGV bodies, and turbo inlet tube as described in the factory service manual.

 

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Step 2

Remove the alternator as described in the factory service manual. Trace out the area on the face of the alternator from which material will be removed (circled in red); if you are unsure of where to remove material from, use the template included with your kit.

 

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Fixture the alternator on your workbench (or mill) and remove approximately 7/32″ of material away from the face of the alternator. It is recommended (but not necessary) to use a mill to machine the alternator, however a 4 1/2″ angle grinder, pneumatic die grinder or Dremel tool will also work. NOTE: TO AVOID MACHINING THE ALTERNATOR YOU CAN USE A 2007 MODEL YEAR SUBARU STI ALTERNATOR.

 

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Cut or “notch” the bottom of the alternator bracket so the alternator can sit lower in the bracket. A 4 1/2″ angle grinder, pneumatic die grinder or Dremel tool will work just fine.

 

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Reinstall the alternator using the supplied belt (Gates # 050340). Check for adequate clearance from the A/C belt to the alternator (circled in red). Be sure that enough material was removed in step 2 to eliminate the possibility of the belt contacting the alternator.

 

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Step 3

Remove throttle body from intake manifold. Rotate the throttle body 90 degrees in the counterclockwise direction from the stock configuration, and re-install the throttle body using Full-Race throttle body spacer and extended hardware (M6). We recommend using new gaskets (Subaru PN#16175AA243) on both sides of the spacer to prevent any leaks.

 

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STOCK TB CONFIGURATION

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SPACER AND GASKETS INSTALLED

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TB ROTATED 90 DEGREES AND SPACER/GASKETS INSTALLED

 

Step 4

Place one Full-Race intake manifold spacer on each cylinder head as shown below. Use the included gaskets (Subaru PN#14035AA421) on both sides of the spacer to prevent any leaks. Next, carefully lower the intake manifold back into position with the throttle body facing the front of the car.

 

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Step 5

Following the instructions in the factory service manual, completely re-install the TGV bodies and the intake manifold in the rotated configuration.

 

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NOTE:

This install should be performed by an experienced and competent mechanic. Before starting the engine, verify that all vacuum lines, fuel lines, and coolant lines have been properly re-routed, and that all electrical connections have been correctly re-established before moving on. Some of these connections may need to be lengthened, shortened, protected, or removed depending on your specific application.

RECOMMENDATION:

It is recommended that the Full-Race reverse-mount intake charge piping and front mounted intercooler be used with the intake manifold in this configuration. Full-Race charge piping is specifically designed for this application and engineered to allow high velocity and minimal pressure drop of charge-air within the system.

 

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