When I ordered my header, it didn't come with any instructions and I couldn't find any guides with pictures or video, so I made one. I'll write out the basic steps, but here is a link to the video I made: https://www.youtube.com/watch?v=l8A4...ature=youtu.be
1. Jack up the front of your car and put it on jack stands.
2. Disconnect the negative terminal of your battery (since we are going to be unplugging sensors).
3. Crawl under the car and unbolt the downpipe of the factory exhaust manifold from the catalytic converter. Also pull the downpipe out of the hangers.
4. Back under the hood, unbolt the top heat shield. There are two bolts on top and two on each side.
5. Unclip the two sensors.
6. Under the car again, there are two bolts that secure the manifold to the motor. Unbolt those. In fact, if you can get in there, just take that shelf out. Totally pointless once we take out the factory manifold.
7. You may want to unbolt the bottom heat shield, too, while you're down there. We ended up taking that off to squeeze the manifold out.
9. Under the hood again, there are 7 nuts securing the manifold to the motor. Take those off.
10. You should now be able to pull the manifold out. Like I said, we ended up taking off the lower heat shield to give us more room to work with. We also took off the manifold gasket because it has a lip on the top that got in the way.
11. With the manifold out, you can remove the O2 sensors. You might need to use some PB Blaster to coax them out.
12. Put some anti-seize compound on the threads of the sensors and install them onto the new header. You don't really need to torque them down, just make sure they are nice and tight.
13. Slide the downpipe on to the header, but don't tighten it down yet.
14. Put a new gasket on the motor and slide the header into place. You will probably either need a friend to help or you will be going back and forth between the hood and under the car trying to wiggle it into place.
15. Secure the header to the motor with the 7 nuts. There's a diagram in the video that shows the right order. Most of these are accessible with a torque wrench, but again, just make sure they are good and tight.
16. Clip the sensors back in.
17. Go back under the car and bolt the downpipe to the cat. Also slide it into the hangers.
18. Now that everything is where it needs to go, tighten the bolt to secure the downpipe to the header. With that stupid shelf from earlier out of the way it shouldn't be too hard to access.
You're done! Keep in mind you will get a check engine light now that you are missing a cat. Dynotronics can take care of that with a tune.