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post #1 of 8 (permalink) Old 07-21-2014, 06:12 PM Thread Starter
dudemanbro
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How to install MSDS header

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

Basic steps:
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.
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post #2 of 8 (permalink) Old 07-21-2014, 06:13 PM Thread Starter
dudemanbro
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Ah damn, can a mod move this to the 2010-2013 Mazda 3 section instead of the Speed 3 section? My bad.
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post #3 of 8 (permalink) Old 07-22-2014, 01:14 PM
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Quote:
Originally Posted by dudemanbro View Post
Ah damn, can a mod move this to the 2010-2013 Mazda 3 section instead of the Speed 3 section? My bad.
Done.


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post #4 of 8 (permalink) Old 08-01-2014, 03:38 PM
Joel
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Do we need to purchase a new gasket from where the header connects to the motor? Where can I get one?

Im afraid of breaking the sensors. How difficult were they?

Sent from: Rose City, Oregon.

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post #5 of 8 (permalink) Old 08-01-2014, 05:50 PM
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Gasket you can get from the dealer. Some people have used the old gasket with no issues if you want to take a chance at it. PB blast the o2 sensors and let it sit for a bit and then use a o2 socket. The rear sensor you can take it off after you remove the OEM. Done this twice already.
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post #6 of 8 (permalink) Old 08-02-2014, 07:06 AM Thread Starter
dudemanbro
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Quote:
Originally Posted by Joel View Post
Do we need to purchase a new gasket from where the header connects to the motor? Where can I get one?

Im afraid of breaking the sensors. How difficult were they?

Sent from: Rose City, Oregon.
Even the factory gasket is only maybe $30, so there's really no reason not to buy one. Better safe than sorry.

The sensors really aren't that bad. I left them both in until I took the manifold out, as you can see in the video, and the bottom one pretty much just came right off. The top one was a little more stuck, but that's mostly because it's buried down in a weird little well.

@pdc001 : What did you do with that little cup that's attached to the upper sensor? I just left it on because I couldn't figure out how to get it off, but it looks pretty stupid and I've been thinking about just cutting it off.
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post #7 of 8 (permalink) Old 08-02-2014, 11:33 AM
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Quote:
Originally Posted by dudemanbro View Post
Even the factory gasket is only maybe $30, so there's really no reason not to buy one. Better safe than sorry.

The sensors really aren't that bad. I left them both in until I took the manifold out, as you can see in the video, and the bottom one pretty much just came right off. The top one was a little more stuck, but that's mostly because it's buried down in a weird little well.

@pdc001 : What did you do with that little cup that's attached to the upper sensor? I just left it on because I couldn't figure out how to get it off, but it looks pretty stupid and I've been thinking about just cutting it off.
That little cup is part of the sensor, its like a shield for the sensor itself.
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post #8 of 8 (permalink) Old 08-02-2014, 11:57 PM
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Replace the gasket, learned the hard way..

K&N SRI.
MSDS Header.
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2012 Mazda 3s 2.5

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