H2 OBX Long Tube Header w/ High Flow Cat Install With Pictures

[pdxrealtor]

Ok.. Finally got these things installed and at 100%. Love the power gain, and can't wait to get a chip or tune. The low end grunt is finally there albeit nothing like a roots blower powered five liter mustang.

These tips and pics will help you with your long tube header install.

I got the OBX high flow cat system. With this system you will need the following additional items:

- 2 M18x1.5 short bolts or drain plugs. You'll plug extra O2 bung holes with these.
- 12 M8-1.25 x 30mm header bolts. I got mine from Fastenall M8-1.25 x 30mm DIN 6921 Class Class 90 Yellow Zinc Serrated Flange Bolt
- An EGR block off plate. Hummer H2 has no EGR to connect to the OBX header. Or you can do what I did.... read below.
- Spark plug wire heat shields or custom plug wires.


Soak for a few days with penetrating oil.. I used some CRC screw loose..

1) Put it on jack stands, ramps won't work. I tried it. Why? Because for the easy breezy removal/install you must remove your tires. Don't fight it, it's not worth it!

2) Remove your wheel well liners. Another must.

3) On passenger side remove the oil dipstick tube, 15mm socket. Remove the bolt. From below, through your awesome wide open access space, work the tube up and out of the hole. Drop a flanged bolt in the exposed hole- MAKE SURE IT's LARGER than the hole! Or use a rag, whatever. I used a bolt because it was non intrusive to other work or test drives.

4) Disconnect all spark plug wires at the spark plug and tuck them up out of the way. I think the only one I didn't have to disconnect was driver side front of engine.

5) Start removing those header bolts. Warm the engine up and then let it cool down a bit so it's just warm to the touch. This will help in bolt removal.