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Old 01-14-2010, 10:30 PM
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Default B13 Header Install

Been messing with my B13, thought I'd post a write-up on installing a header.

14mm socket (preferably long)
12mm socket
Needle Nose Pliers
Adjustable Wrench or Vise Grip

1. Jack up the car high enough that you can get all the way to the cat converter
2. Undo the three 14mm nuts holding the downpipe to the manifold.
3. On the upper, right-hand corner of the engine, there is a black box with two hoses connected to it. Use the pliers to pull back and move the retaining rings, sliding them over the hoses. Pull the bottom hose from it's nipple connection, then undo the three 12mm bolts holding the black box, and flip the box upside down to give access to the EGR tube.
4. Unscrew the EGR nut from the manifold, and use some muscle to pull the tube out of the manifold. I'm not sure the size wrench needed to undo the EGR nut from the OEM manifold, but it's tough to loosen, so use some PBR Metal Blaster or WD40. If necessary, use a vise grip to grab it and turn. Getting the tube out requires some muscle too.
5. Unplug the O2 sensor wire from the harness. If you can reach it from underneath, use a wrench to undo the O2 sensor from the manifold. Some later models (Cali spec?) have two sensors, get both of them.
6. Use the 14mm sockets and undo the eight nuts holding the manifold to the block. Use a breaker bar if necessary, but be careful not to break a stud, they're a pain to replace. The one under the radiator hose is hard to get to, so use either a long socket or an extension to get to it.
7. Disconnect the downpipe from the cat converter.

Some manifolds are different than others and may have ports for two O2 sensors (like my Stillen header), some may not, so if you have to, get a plug for the second O2 sensor port.

Also, the OEM manifold has the studs for the downpipe welded into it, so you might have to get some new bolts to connect the header to downpipe on your manifold (as well as possibly a gasket for this connection if you didn't get one or if you need one).

Install in reverse order, but I found it easiest to connect the downpipe to the manifold before trying to connect it to the cat converter.

Good luck and enjoy!
Attached Images
File Type: jpg Manifold etc..jpg (88.1 KB, 4 views)
File Type: jpg Downpipe.jpg (85.1 KB, 4 views)
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Old 01-15-2010, 05:02 PM
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As always, to help prevent leaks, tighten bolts from the engine... back. Start at the head, then the header to DP, etc.
Formerly: 2009 Subaru Impreza WRX 5 door (255whp/267wtq) -- 2004 Subaru Impreza WRX Wagon (Stage 2) -- 1998 Subaru Legacy GT
Currently: Old man status, 2009 Outback Uber/Lyftmobile
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