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You keep saying "ex head" Your ex head and lx head and dx head all have the same bolt pattern, so you dont need to change the head to change the manifold that bolts to it. I think your also getting the parts mixed up a little- you cant weld a cat onto a header... well, I guess you could, but that would just be stupid and it would probably be an inch from the pavement so you couldnt run a cat back. Here is how the parts go:

Engine Head> header (exhaust manifold)> Downpipe with cat converter in it (this is one piece of pipe with flanges on either side and the cat in the center [if you cant get a hold of an OEM downpipe with cat, get the Random Tech pipe, OR get a test pipe and a universal weld-in cat], then your cat back exhaust system.

 
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So OBX header > Random Tech downpipe (I think this is the right one *) > OBX catback


* http://shopping.lightningmotorsports...cat=664&page=1

Ok, that would work but I would like to avoid having the CEL on if possible, so looks like I should get a test pipe w/ a weld in cat
I'm assuming these universal cats have O2 sensor positions...right?

Anybody know any good websites for downpipes or universal cats?

Do any local places like Auto Zone or Advance Auto carry them?




What would the disadvantages of the Random Tech test pipe....besides the CEL?
Would I be able to smell the exhaust real bad?
Would it be super loud?

 
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Hope that helped.

 
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Yes sir, it did!
thanks again for all the help

Also it says it will illuminate the CEL and it's a not for highway use....you sure it has a cat in it?
( http://shopping.lightningmotorsports...cat=664&page=1 )

That one is made by Skunk2 and not RT
I don't think it's the right one

I assume the one I need is something like this http://shopping.lightningmotorsports...cat=457&page=2

that would work great, but I'm pretty sure the pipe diameter on my car is 2.25 inch and that one is 2.5 inch....



So will a testpipe will replace a downpipe?

This is the header I was looking at getting
http://cgi.ebay.com/ebaymotors/OBX-4...4369QQtcZphoto

Is that a downpipe I see there included, or is it the header just in two pieces to make it easier to install?

 
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That first link is for a test pipe... aka no cat.

That second link is what you need, or at least the type of product you need (did you say you had a 6th gen or 7th gen?). Here is a list of the part numbers of RT products that are downpipes with cats: http://www.randomtechnology.com/honda.html

That header is a race header, a 4-2-1, which will make it so you cant run the RT downpipe... or at least that is how it is on the 7th gen. I'm not sure exactly how your exhaust system looks on the 6th gen- get pics of the ex header and front part of the exhaust and I can tell you. But on race headers they usually bolt right up to the begining of the cat back.

 
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Ok, I think I'm going to buy that header and the cat back

I'll order a cat if I need it, and if the header bolts directly to the catback, then so be it

thanks again for everything, Triz

 
Rep Power: 388

Yuppp.

Not that I really need it, but you should learn how to rep people on the forum.

 
Rep Power: 388

Yuppp.

Not that I really need it, but you should learn how to rep people on the forum.

 
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ohhh I'ma rep the **** outta you dude!

how do I do it?

 
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Triz, your patience exceeds even mine.

 
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that hurts, Speedfoos

it's not my fault I was born car-tarded!

 
Rep Power: 388

Press the balance that is on ever post by other people, if you hover over it, it should say reputation... click "I approve" and type a message on why w/ ur name.

The days when I feel like I'm going to snap... I stay off the forum for a few days. Thats my secret.

 
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cheapest place to find o2 extenders?

 
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Go to the first post of this thread and click on the links I provided.

 
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Triz, I got the catback and header

It appears that the OBX header and catback leave room for a cat. converter

I'm assuming you reccomend the Random Tech cat?
(http://shopping.lightningmotorsports...cat=457&page=2)

 
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Yeah, go with the random tech cat if you want a higher flowing downpipe and cat then the stock one and dont want to pollute the world without running one. In fact, the RT pipe will flow just as good as running catless, without the added harmful effects on the environment. Pick it up

 
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Ah man I wish I had came to this thread b4. Just bought a whole catback exhaust which was on a EM2 EX but I have a 4dr 05 LX. Feelin sooo down

 
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Ok, so they offer an "installation kit" with the catalytic converter
I'm assuming this is the bolts I need to install it


Also, what size 02 extender cable would be appropriate?
I'm guessing 24 inch would be plenty, but car is an LX, so they stock cat position was pretty close...

 
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The thread was here, you werent... that sucks! lol

Answer is covered in first post of this thead!

 
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I just bought a 2008 civic ex-l 2dr. I need to change the cataylic converter, honda wants $580 my question is can i eliminate it with a pipe and connect the o2 sensors or do i need to replace it? Thank you for your help. Justin

 
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depends on what state you live in. does your area require an e-check?

 
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No, i live in florida we don't have emission testing. I will be keeping the stock muffler, and don't really want a loud exhaust. Will this be possible without the cat?

 
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If your cat failed, then take it to honda- it has an extended warranty and should be replaced for free.

 
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Yea bro, but no worries I had the muffler shop custom do it without messing up with my headers or censors. So I'm running the new catback perfectly!

 
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Triz - got the header, cat and catback on.
It went pretty well, BUT there was about an inch and a half gap I had fudge
This fudging caused the S-shaped section of the cat-back to be planted firmly against a chunk of the frame, causing it to be quite loud as you'd imagine.
I need some advice
What are my options here?
is there a some kind of spacer avaliable for it?

I'm thinking taking it to a muffler shop and having them weld a piece into my midpipe to make it longer is going to be my best bet

 
Rep Power: 388

Yeah that might be the best idea... Can you tell where the problem is? Look for if any of the exhaust hangers dont hang directly inline with those welded on your car, this will be pretty obvious and give you a good idea of where the problem starts. Also look to see if the bend over the control arm is a good bend and not making any contact

 
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ok. I have an ex with megan headers, megan downpipe/test pipe. first I had an apexi n1 catback and it rattled when it was abour 3-4k rpm. I took off the whole cat-back and put my stock cat-back on and it still rattles at around that rpm. It seems the rattling is coming from the testpipe/down pipe. any ideas on why that is?

and if something is wrong, is there a point on running just the megan headers with stock downpipe and stock catback or even the megan headers with stock downpipe and apexi n1 catback? the rattling is kinda annoying...

 
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theres probably a gap btw the header and downpipe. mine did that check it out and make sure its flush. maybe get a gasket.

 
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I got it figured out, just took it to the local Midas muffler shop and had them weld in a flexible piece

on to the rear disc conversion!

 
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Its lose. Are you using the stock spring loaded bolts?? Those things are crap and might have snapped. If your using the stock downpipe you need that donut gasket at the top of the downpipe that creates the seal at the header connection. Also use real hardware, not those stocker spring bolts.

If thats not the problem then check the connection between the downpipe and the cat back.

If thats not the problem... then check clearance issues. The exhaust flexes because the engine flexes. So it might be hitting your sway bar or something. If you have an lx/dx sway on your car the cat will be touching, there just isnt enough room and you'll need to lose the bar and pick up an EX or RSX front sway.

Report back.