Civic Hx Header
08-24-2006, 01:36 PM
#1
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Civic Hx Header
My 98 Civic Hx has a cracked header(no idea how this happened). I was wondering if an Ex or Dx header would fit on my car? Im going to try and pull one from a junk yard and an hx is hard to find. Also, if I were to buy an aftermarket header off ebay for like 50 bucks do you guys think it would be a wise investment, and do the aftermarket headers connect to the cat or go directly to the exhaust( I wonder this because there is an o2 sensor on my cat, and also one on the header).
Thanks for the replies, Matt
Thanks for the replies, Matt
08-24-2006, 02:03 PM
#2
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Re: Civic Hx Header (98CivHx)
All D-series Exhaust manifolds will fit on ur HX motor, if you went on ebay to buy a 50 dollar header, you wouldn't see many HP gains and wouldnt be that high of quality but it wouldnt be a bad investment because you need one. The EM will bolt to your cat, and should have an o2 sensor bung on it.
08-24-2006, 02:14 PM
#3
Go Tigers!
Re: Civic Hx Header (bpwrdeg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bpwrdeg »</TD></TR><TR><TD CLASS="quote">All D-series Exhaust manifolds will fit on ur HX motor, if you went on ebay to buy a 50 dollar header, you wouldn't see many HP gains and wouldnt be that high of quality but it wouldnt be a bad investment because you need one. The EM will bolt to your cat, and should have an o2 sensor bung on it.</TD></TR></TABLE>
some truth to this.
the HX has a unique header design. I belive the cx hatch also shares the same header, but anyways. The catalytic converter is integrated into the "header" this is to allow it to heat up quicker and start working sooner. If you get an y8 header you will have no catalytic convertor.
There's 1 pro to this, and that is that you have no cat convertor. HOWEVER. Since your car is obd2 and run off of the vtec-e system. The wideband o2 sensor exists in the factory catalytic convertor. Normally o2 sensors don't matter as much as the wideband 5wire o2 sensor that is found on the civic hx and vx. The ecu uses this sensitive o2 sensor to make very precise measurements so that it knows how to control the engine to get the amazing 44mpg that the hx offers.
If you got an ebay header, you would have no way of correctly installing the o2 sensor and you would never run in "lean-burn" mode. You'd prob lose about 10mpg on the highway. However, if you got the exhaust from another civic or shortened the exhaust that you currently have, and add a catalytic convertor, you would be able lengthen the wires of yoru current 5wire sensor and plug it up in the new cat position.
some truth to this.
the HX has a unique header design. I belive the cx hatch also shares the same header, but anyways. The catalytic converter is integrated into the "header" this is to allow it to heat up quicker and start working sooner. If you get an y8 header you will have no catalytic convertor.
There's 1 pro to this, and that is that you have no cat convertor. HOWEVER. Since your car is obd2 and run off of the vtec-e system. The wideband o2 sensor exists in the factory catalytic convertor. Normally o2 sensors don't matter as much as the wideband 5wire o2 sensor that is found on the civic hx and vx. The ecu uses this sensitive o2 sensor to make very precise measurements so that it knows how to control the engine to get the amazing 44mpg that the hx offers.
If you got an ebay header, you would have no way of correctly installing the o2 sensor and you would never run in "lean-burn" mode. You'd prob lose about 10mpg on the highway. However, if you got the exhaust from another civic or shortened the exhaust that you currently have, and add a catalytic convertor, you would be able lengthen the wires of yoru current 5wire sensor and plug it up in the new cat position.
08-24-2006, 02:56 PM
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Re: Civic Hx Header (Bense)
I have a DX exhaust manifold and it looks pretty identical to the HX exhaust manifold. Just a heads up. 
I think it would be just a matter of swapping o2 sensors?? Can someone varify this?
I think it would be just a matter of swapping o2 sensors?? Can someone varify this?
08-24-2006, 03:22 PM
#5
Go Tigers!
Re: Civic Hx Header (BlackHXCoupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackHXCoupe »</TD></TR><TR><TD CLASS="quote">I have a DX exhaust manifold and it looks pretty identical to the HX exhaust manifold. Just a heads up. I think it would be just a matter of swapping o2 sensors?? Can someone varify this? </TD></TR></TABLE>
SHOULD be
I think it would be just a matter of swapping o2 sensors?? Can someone varify this? </TD></TR></TABLE>SHOULD be
08-24-2006, 04:37 PM
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Heres a link to the header Iam considering buying.http://cgi.ebay.com/ebaymotors/96-97...20530353QQrdZ1
There seems to be two 02 sensor bungs, so my question is would the obd2 run correctly and would this header replace the cat?
Thanks
There seems to be two 02 sensor bungs, so my question is would the obd2 run correctly and would this header replace the cat?
Thanks
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08-25-2006, 04:29 AM
#9
Former Moderator
Re: Civic Hx Header (98CivHx)
Dude you're going to be screwed if you go buy a DC header for the EX model and think it'll bolt right up to your HX engine, because it doesn't even come close on the bottom side where the exhaust meets up.
Here's the deal with the HX:
The HX has a uber-shitty exhaust manifold with a cat built into it, thus making it impossible to buy a true bolt-on header.
You can make a header work, but it'll take some wiring and an exhaust shop with some decent welding skills.
Here's what you'll need:
1.Good header for the EX model civic from 96-00 - I suggest DC Sports like others have already.
2. Exhaust manifold gasket from Honda (if your Dc doesn't come with one)
3. Catalytic convertor - this can be a new convertor meant for the 96-00 Civic EX, or you pull a good used convertor off of any 96-00 Civic EX as long as that's legal in your state
Okay you can either bolt up the header yourself and drive the car open header style to a muffler shop and have them finish the bottom side, or have them install the header and then get to the welding.
"Welding what?"
Because the HX has the cat in the manifold stock, the exhaust is longer than the EX model and it actually goes halfway under the engine. This leave no room for a cat. covertor, which you MUST have on that HX or you'll have a permanent check engine light.
Have the header on, then the muffler shop will need to cut a section out of your exhaust, fit the new EX-style convertor in place, then weld flanges to the convertor to keep it a bolt-in style convertor rather than have them weld it all up and be a huge PITA later if you ever need to change exhausts, cats, etc.
Now the last part is o2 sensor wiring. Because you'll be running an EX style cat and header the original o2 wiring won't reach like stock, so you'll end up having to extend these wires on at least one sensor - maybe both. When doing this SOLDER and SHRINK WRAP the wires. Don't use any connectors on where you extend the wires or you'll be throwing o2 chcek engine lights.
Lastly when installing an aftermarket or even used EX cat. convertor you will still run the risk of throwing the ever popular "Catalyst efficiency low, bank 1" check engine code because the HX is the shittiest when it comes to sensitive emissions controls.
All of this, or just sack up and buy another stock manifold and bolt it on yourself.
Here's the deal with the HX:
The HX has a uber-shitty exhaust manifold with a cat built into it, thus making it impossible to buy a true bolt-on header.
You can make a header work, but it'll take some wiring and an exhaust shop with some decent welding skills.
Here's what you'll need:
1.Good header for the EX model civic from 96-00 - I suggest DC Sports like others have already.
2. Exhaust manifold gasket from Honda (if your Dc doesn't come with one)
3. Catalytic convertor - this can be a new convertor meant for the 96-00 Civic EX, or you pull a good used convertor off of any 96-00 Civic EX as long as that's legal in your state
Okay you can either bolt up the header yourself and drive the car open header style to a muffler shop and have them finish the bottom side, or have them install the header and then get to the welding.
"Welding what?"
Because the HX has the cat in the manifold stock, the exhaust is longer than the EX model and it actually goes halfway under the engine. This leave no room for a cat. covertor, which you MUST have on that HX or you'll have a permanent check engine light.
Have the header on, then the muffler shop will need to cut a section out of your exhaust, fit the new EX-style convertor in place, then weld flanges to the convertor to keep it a bolt-in style convertor rather than have them weld it all up and be a huge PITA later if you ever need to change exhausts, cats, etc.
Now the last part is o2 sensor wiring. Because you'll be running an EX style cat and header the original o2 wiring won't reach like stock, so you'll end up having to extend these wires on at least one sensor - maybe both. When doing this SOLDER and SHRINK WRAP the wires. Don't use any connectors on where you extend the wires or you'll be throwing o2 chcek engine lights.
Lastly when installing an aftermarket or even used EX cat. convertor you will still run the risk of throwing the ever popular "Catalyst efficiency low, bank 1" check engine code because the HX is the shittiest when it comes to sensitive emissions controls.
All of this, or just sack up and buy another stock manifold and bolt it on yourself.
08-25-2006, 08:48 AM
#10
Go Tigers!
pretty much what I was saying but with much greater detail.
I would suggest going to obd1. But there is no obd1 equivalent map. Trust me, I've looked. And don't even consider running it on a p28
I would suggest going to obd1. But there is no obd1 equivalent map. Trust me, I've looked. And don't even consider running it on a p28
08-25-2006, 10:08 AM
#12
Honda-Tech Member
Re: Civic Hx Header (B18C5-EH2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 »</TD></TR><TR><TD CLASS="quote">Dude you're going to be screwed if you go buy a DC header for the EX model and think it'll bolt right up to your HX engine, because it doesn't even come close on the bottom side where the exhaust meets up.
Here's the deal with the HX:
The HX has a uber-shitty exhaust manifold with a cat built into it, thus making it impossible to buy a true bolt-on header.
You can make a header work, but it'll take some wiring and an exhaust shop with some decent welding skills.
Here's what you'll need:
1.Good header for the EX model civic from 96-00 - I suggest DC Sports like others have already.
2. Exhaust manifold gasket from Honda (if your Dc doesn't come with one)
3. Catalytic convertor - this can be a new convertor meant for the 96-00 Civic EX, or you pull a good used convertor off of any 96-00 Civic EX as long as that's legal in your state
Okay you can either bolt up the header yourself and drive the car open header style to a muffler shop and have them finish the bottom side, or have them install the header and then get to the welding.
"Welding what?"
Because the HX has the cat in the manifold stock, the exhaust is longer than the EX model and it actually goes halfway under the engine. This leave no room for a cat. covertor, which you MUST have on that HX or you'll have a permanent check engine light.
Have the header on, then the muffler shop will need to cut a section out of your exhaust, fit the new EX-style convertor in place, then weld flanges to the convertor to keep it a bolt-in style convertor rather than have them weld it all up and be a huge PITA later if you ever need to change exhausts, cats, etc.
Now the last part is o2 sensor wiring. Because you'll be running an EX style cat and header the original o2 wiring won't reach like stock, so you'll end up having to extend these wires on at least one sensor - maybe both. When doing this SOLDER and SHRINK WRAP the wires. Don't use any connectors on where you extend the wires or you'll be throwing o2 chcek engine lights.
Lastly when installing an aftermarket or even used EX cat. convertor you will still run the risk of throwing the ever popular "Catalyst efficiency low, bank 1" check engine code because the HX is the shittiest when it comes to sensitive emissions controls.
All of this, or just sack up and buy another stock manifold and bolt it on yourself.
</TD></TR></TABLE>
Is this all the same for the DX models? with the super sensitive o2's and all? would the car run like **** w/o the 2nd o2 sensor or would you just lose gas milage? would threading anouther hole on the header and puting the 2nd o2 in there help at all?
Here's the deal with the HX:
The HX has a uber-shitty exhaust manifold with a cat built into it, thus making it impossible to buy a true bolt-on header.
You can make a header work, but it'll take some wiring and an exhaust shop with some decent welding skills.
Here's what you'll need:
1.Good header for the EX model civic from 96-00 - I suggest DC Sports like others have already.
2. Exhaust manifold gasket from Honda (if your Dc doesn't come with one)
3. Catalytic convertor - this can be a new convertor meant for the 96-00 Civic EX, or you pull a good used convertor off of any 96-00 Civic EX as long as that's legal in your state
Okay you can either bolt up the header yourself and drive the car open header style to a muffler shop and have them finish the bottom side, or have them install the header and then get to the welding.
"Welding what?"
Because the HX has the cat in the manifold stock, the exhaust is longer than the EX model and it actually goes halfway under the engine. This leave no room for a cat. covertor, which you MUST have on that HX or you'll have a permanent check engine light.
Have the header on, then the muffler shop will need to cut a section out of your exhaust, fit the new EX-style convertor in place, then weld flanges to the convertor to keep it a bolt-in style convertor rather than have them weld it all up and be a huge PITA later if you ever need to change exhausts, cats, etc.
Now the last part is o2 sensor wiring. Because you'll be running an EX style cat and header the original o2 wiring won't reach like stock, so you'll end up having to extend these wires on at least one sensor - maybe both. When doing this SOLDER and SHRINK WRAP the wires. Don't use any connectors on where you extend the wires or you'll be throwing o2 chcek engine lights.
Lastly when installing an aftermarket or even used EX cat. convertor you will still run the risk of throwing the ever popular "Catalyst efficiency low, bank 1" check engine code because the HX is the shittiest when it comes to sensitive emissions controls.
All of this, or just sack up and buy another stock manifold and bolt it on yourself.
</TD></TR></TABLE>
Is this all the same for the DX models? with the super sensitive o2's and all? would the car run like **** w/o the 2nd o2 sensor or would you just lose gas milage? would threading anouther hole on the header and puting the 2nd o2 in there help at all?
08-25-2006, 10:45 AM
#13
Former Moderator
Re: Civic Hx Header (EKEJ6)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKEJ6 »</TD></TR><TR><TD CLASS="quote">
Is this all the same for the DX models? with the super sensitive o2's and all? would the car run like **** w/o the 2nd o2 sensor or would you just lose gas milage? would threading anouther hole on the header and puting the 2nd o2 in there help at all?</TD></TR></TABLE>
Yeah it's the same for a DX, and unfortunately aftermarket cats on any 96-up Civic can throw check engine codes for catalyst insufficiency low, bank 1.
The second 02 goes into the cat itself - the muffler shop should know that already.
Also running w/o the secondary o2 will result in a permanent CEL.
Is this all the same for the DX models? with the super sensitive o2's and all? would the car run like **** w/o the 2nd o2 sensor or would you just lose gas milage? would threading anouther hole on the header and puting the 2nd o2 in there help at all?</TD></TR></TABLE>
Yeah it's the same for a DX, and unfortunately aftermarket cats on any 96-up Civic can throw check engine codes for catalyst insufficiency low, bank 1.
The second 02 goes into the cat itself - the muffler shop should know that already.
Also running w/o the secondary o2 will result in a permanent CEL.
09-01-2006, 04:07 PM
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Re: Civic Hx Header (Bense)
My civic has nearly the same configuration (1996 Civic lx D16y7...except I have two 4-wire o2 sensors. --I guess, I have never looked at them... The Hx has the wideband sensor after the cat so the ECU can get a better reading (Part of the lean-burn tech.)
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