This post is a little late, but I've installed the infamous OBX 3.5 Headers on my car.
I do not have that many pictures, but here is a quick overview of the installation process, I will not go into gross detail, because the swap happened awhile ago.
Installation (Sort of in order)
-Put the front end of the car on stands-Remove Upper Intake Manifold
-Remove 02 Sensors
-Drop the Y-pipe
-Work on the front collector (6 bolts)
-Begin to unbolt the rear manifold (if you're really pro you can do all 6 bolts)
-Get the jack and support the engine/tranny
-Drop the crossmember
-Remove the rear mount thingy (4 bolts on the motor, it's what the rear mount attaches to)
-Drop the rear header
-Install OBX headers
-Delete EGR
Reverse process, starting w/ the rear mount thingy.
Problems/Things to know...
-There will be an EGR delete during this process, I'm still working a way around this so I won't have a CEL-Two M18x1.5 bolts will be required (unless you're running a wideband and want to plug it into the headers) to block off the extra O2 ports.
-You can not put the rear o2 sensor on the rear collector, the steering rack is in the way, I used one on the front bank and one near the oil pan, use the screws on the rear collecter and the other o2 port near the oil pan.
-I had to extend the O2 sensor wires for it to reach the location pictured below.
-Get OEM nissan gaskets, atleast the O shaped one, people suggest re-using the old header gasket on your car, they say it's a superior design, I am using the OBX manifold gaskets and so far no problems, but if you really want to go the extra mile, order some new nissan manifold gaskets and O gaskets (remember you're still saving hundreds of dollars compared to cattman, so put that money to good use).
Onto the media/fun stuff....
Drive around with your max like this, you will OWN THE ROAD (it is scary loud, see vid below).
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