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Old 07-04-2006, 12:36 PM   #1
mike 1
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Join Date: Feb 2005
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Location: Bel Air, MD
What I Drive: 2006 Subaru WRX STi

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Thumbs up CFM Silicon Couplers for SVTF Intake Manifold

Just thought I'd do a short-term testing (15 miles) write up on the CFM Silicon Couplers for the SVTF Intake manifold. If you dont know what I'm talking about; click the link!

Ok, first, you will want to oder the couplers in either red, blue or black. I chose red beause thats just my accent color.

Tools you'll need to do it - 1/4 drive ratchet, 8mm socket, 1/4" socket, flat head screwdriver, pliers or wire cutters (dikes).

Prepare for the removal/ install:

Unclip the injector harness fromt he injecotrs and push it out of the way. Next, unclip the Fuel Pressure regulator/ sensor from the end of the rail and remove the vac. line from the sensor. Now, remove the two 8mm bolts securing the fuel rail, rock the rail back and forth til the injectors come loose, unplug the vac. line from the center/ bottom of the rail and swing the rail out of the way (I set the rail on my strut bar, worked perfect!). You are ready to begin!

Now its time to remove your rubber boots. If you have an 02 you definitely have those stupid 'clip' clamps. I know my friends 04 has the screw type clamps...those you just simply unscrew. To remove the clip clamps, just grab the head where it hooks and take pliers (I used cutters since it has a better head), grab the hook part (its at the 12 o'clock position) and just give it a twist. Then, just pull the whole clamp out. Repeat 7 more times. Now, once the clamps are off, grab the throttle body and push towards the firewall. This is just to separate the two halves. You dont have to make a lot of room, just enough to get the boots out. I grabbed a side and pulled it out from the sides. The way they are shaped makes it tough to pull straight up. Reapeat until all your boots are off.

Now to install the new couplers...what I did was took all my 8 clamps and pre tightened them. Its a lot easier this way since you wont have to hold while you screw the clamps a lot. Put two clamps on the MOTOR side of the intake manifold on each runner. Now, take a coupler and put it on the THROTTLE BODY side of the manifold (trust me!) Get the boot into position and then take one of the clamps and slide it into place and clamp it down snug. Do that on each runner. Now the tricky part (a second set of hands comes in here) grab the throttle body and alternator side of the manifold and lift and slip the assembly into the motor side of the manifold. 1 and 2 will go on easy, but 3 and 4 will fold under. Take a flat head it lift the folded part over the runner (your friend comes in here). Once you do that, pull the TB side into place as hard as possible and have your friend torque the MOTOR side clamps. Do 1 and 4 first. once you do that, do 2 and 3. Thats it. Go over and retorque the clamps with a socket/ ratchet. Reinstall your vac lines, fuel rail and injector harness and go for a drive!

Total time is about 15-20 minutes.

I would rate this on a difficulty scale of 2 out of 5. Its something anyone that can do basic car stuff can handle. The only 'scary' part, if you dont have a second person to help and you can get those couplers to unfold no matter what you try, you are stuck. Just be prepared to have a buddy available.

Now I can hold 10psi with out the boost leaking out of the rubber couplers.

For $20 + Shipping this is something we should ALL do! For turbos its a must, and for the NA guys, hey, it looks cool. When I get my camera back from my wife tonight, I'll take a few installed pictures!


Mike S.
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