Rep Power: 388

^ Anything of quality. Mainly its going to come down to which exhaust note you want so research on youtube whatever exhaust your considering so you can get an idea of what it sounds like. I've seen some 7th gens lately with some really ridiculous exhausts that you can hear blocks away.. I'm not sure if thats something your into, but I'm not. I like a quieter exhaust at around town speeds, and then a little more noise outta it when your pushing the car as opposed to a loud exhaust ALL the time that just gets louder the higher the RPM's. If you wanna get a little more serious, sort the exhausts by pipe diameter and research which diam is better for your car and driving style. Meaning, your not going to want a 3 inch exhaust all the way back kuz thats over kill... You'll prob end up with somewhere between 2-2.5 inch exhaust diam.

 
Rep Power: 266

96-00 DC 4-2-1 exhaust questions:

I want to install one on my DX but I recall that the pipe hangs lower on the EX compared to the DX, so it won't mate properly. In other words the flang will be an inch or 2 lower or something. Is that true? Isn't that true on the 7th gen?

What is that piece sticking out where the pipe goes from 2 to 1?

What brand cat do you guys recommend? The Random tech is really expensive. OBX's go for like half the price.

 
Rep Power: 388

The exhaust pipes all hang on rubber donut hooks, so if there is any difference in how much the pipe hangs (which there wasnt a difference on my 7thgen) then you can just nudge it enough to make it mate and then torque the two pieces together.

As for the picture of the header you got- most sites have the wrong pictures for the headers they are selling, such as a pic of a wrx header shown for a civic header.. or a pic of a B series for a D series motor. Its pretty ridiculous. But the only reason to have tabs down there would be for the headshield or to hold wires for the O2 sensor. On my race header by DC, it had a bung in about the same spot for the secondary sensor.

As for cats, if your running a race header you wont have a cat, and adding one after the header doesnt make any sense. If you want a cat, just the the 4-1 header and mate it to a RT cat or get a test pipe and have a machine shop weld in a different cat, or stick with the EX downpipe/cat.

 
Rep Power: 247

http://www.procivic.com/pages-produc...827/index.html

is this a good answer for LX/DX? anyone know if this part actually gives a LX auto hp gain for $540??

 
Rep Power: 266

Why is a 4-2-1 header a race header? I thought the difference was simply so that you can access things easier compared to the 4-1 which requires the whole manifold to be removed.

 
Rep Power: 266

I just wanted to ask. If I install a full EX exhaust system, will it affect my fuel economy/power negatively due to a different back pressure since I have the Y7 and not Y8 engine?

 
Rep Power: 388

Basically the main difference is one has a cat and one doesnt (the race header). Race headers are set up to flow better, so they have less pipes merging at a time, hence the 4 to 2 to one. The regular headers just dump them all at once- four pipes (coming off each cylinder) into one thats the exhaust.

 
Rep Power: 388

If your doing all OEM parts, you should be safe. You will prob get a little extra power from a better flowing exhaust. If your doing aftermarket EX parts, you might lose a few mpg's- but nothing that you couldnt just as easily attribute to variance- and assuming you dont get bad parts, you'll get better power as well.

 
Rep Power: 266

I think I'm going to go this route. Seems everyone has an EX, so it shouldn't be hard to find a full EX oem exhaust. Thanks for the info.

 
Rep Power: 388

Not a problem. Good luck bro!

 
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http://www.procivic.com/pages-produc...827/index.html

anyone have this part on DX/LX? anyone have header with cat converter from ebay for DX/LX?

 
Rep Power: 388

Link doesnt work

 
Rep Power: 266

Okay, so what would happen if you run a 4-2-1 header with a cat after it? Does it get damaged?

You know, in a sane world, I would be able to find a 1-piece stainless steel manifold cat for my car. Instead, all I can find is 2-piece steel and cast iron. Why only cast iron? They sell a full steel one for the 7th gens but not the 6th. Have you guys seen anything?

 
Rep Power: 266

Okay, here's another idea. Is it possible for a muffler shop to cut off the cast iron portion of my stock manifold, and to replace it with steel? Could they make a steel upper for it or would I need an upper they could modify?

 
Rep Power: 388

The hole thing is cast iron, so your talking about having a whole new stainless steel manifold custom made for use with your stock cat? MMmmm.. I wouldnt.

The material its made out of isnt all that important. IMO cast iron is more likely to crack then steel, and stainless steel just looks nice. Ceramic coatings will keep the heat down a little. No mater what material it is, it will all flow the same regardless. The difference comes from what diameter and length the pipes are, and how they meet up.

Okay, so what would happen if you run a 4-2-1 header with a cat after it? Does it get damaged?------->>> well, it would flow better, but then you'd just be slowing the flow down with the cat- unless you get a high flowing cat- like that of random tech's. Cats are more effective the closer to the source (the head of your engine) they are, thats why you dont see cats just before the mufflers. The reason is the cats need to be hot to do their job- which i believe is why a cold engine is less efficient then a warm one (maybe I'm wrong here with that conclusion, but you get the picture).

If I were you.. I'd figure out what my goals are.

Do you want all out performance-- get a race header and ditch the cat.
Do you want performance thats legal-- get an aftermarket header with a high flow cat.
Do you just want looks-- get a shiny header from ebay and use whatever cat you want- generic autozone replacements, or stock, whatever.
Do you just want a replacement for cracked header/failing cat-- get stock stuff if at affordable price (dont buy from honda).

 
Rep Power: 266

I passed up this DC 4-2-1 with a new Denso 02 sensor. -_-

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT

Any way, my main goal is to get rid of the leak. It seems finding an EX parts is kinda hard. The manifolds are rare. So I'm going with this Dorman manifold, though it's a bit cheaper on ebay.

 
Rep Power: 388

You might try checking out the forum honda tech. They are into older civics more so then over here, which was/is primarily 7th gens. They always sell parts for pretty cheap over there too. If you cant find one, then grab that amazon one, although you can def tell its not a honda part based off the design and gawky gasket.

 
Rep Power: 266

It's a gamble, but so is a used OEM part. Used cast iron can crack any day. At least with these new ones they will last a few years, hopefully. There's this limited lifetime warranty on it, but I don't understand what that means in real world terms. Let's say a crack forms in it, does it mean I can have it replaced? It just doesn't seem likely.

Is there anything I can do to the cast iron to make it last longer? I noticed many iron manifolds are sprayed with silver "paint." That at least prevents rust.

 
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Anyone had experience with the Magnaflow header/cat package?

 
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That looks like the same one I got yesterday

 
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This is the header I just ordered for mine yesterday. Ill let you know how it does........cost me a total of 55 bucks.Hopefully ill get better mpg due to my old manifold and cat being clogged.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWNX%3AIT

 
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Okay, So I've read pretty much the entire post, i still haven't seen any info on direct DX to EX full exhaust system swap. Here's my question

If I get a full EX stock exhaust system, including header manifold, down pipe and cat, and then the exhaust plus o2 sensors, will this fit directly into the DX system?

I know there was mention of a Sway bar needing to be replace because the ex and dx sway bars are different, but only for the Coupe. I'm doing this for a DX 4 door. Will i need to replace this?

Lastly, the o2 sensor story, I know I can get an extender for the secondary o2 sensor but does any one know if i get the o2 Sensors from the EX will it fit? Triz mention that you can fit male to male and female to female, but why would they have different connectors aren't they all the same, just different length ?

Would be great if these could be answered,
Thanks
Sao

 
Rep Power: 233

Yes it will fit into the Dx exhaust routing space under the car. The sway bar should be replaced because the Dx one rubs against the pipe and causes horrible vibration especially in the cold (personal experience). As far as the O2 sensors are concerned just get the extensions, new wiring and sensors will cost more. I did my swap for under $500 for new quality parts, but since you want a cat it will probably cost more. I would set aside $800 to $1000 for everything. Anymore questions?

 
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There's a guy parting out a civic due to an accident (it was a write off), the accident was from the side, and he is parting everything out, it's an ex, so i figure i'll see what the cost is for everything from the header mainfold o2 sensors and cat all the way to the muffler, so he was only asking $180. Car only had 70 000Km on it. If i get the sensors and don't need to worry about buying the extension, the entire thing would cost under 200$. is it worth it or should i just buy new parts?

 
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What is the point of swapping stock ****?

 
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So when i want to upgrade the header manifold, and exhaust it won't be an issue.

 
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pointless waste of money. Just do it with aftermarket stuff... Its not an issue in the first place, its really simple.

 
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i have a 2001 honda civic lx that has major issues with my exhaust system. first off my manifold has hair line cracks in it, from what? well i let someone work on my exhaust and it keeps getting worse to worse. they welded my cracks in manifold and next thing i knew my whole exhaust is taken apart, the cat convert off. they added another one but it seems louder and it has this viberating sound like it not secured right. well they cut off my tailpipe cuz they wanted to shorten and bring more under the car due to it scraping when i pulled into a driveway cuz the car is low, and did i say they dont weld very good.
They have a DC16 header 4port to 2 port they want to put on my car but say they are having a flange made. Is this correct or are they creating more problems for me?
SO, i need to know what stuff i really need to have to make my exhaust legal and quiet and done the right way? Please help

 
Rep Power: 388

Wrong thread.

Sounds like you got a race header on there.. if so (and if this is a d16 motor... the thread is for a d17).. then you need to have a cat in there somewhere to make it legal, and O2 sensors connected. After that it just needs to be under the dB limit for noise your car is allowed to make. If all that is taken care of, its legal.

 
Rep Power: 388

Wrong thread.

Sounds like you got a race header on there.. if so (and if this is a d16 motor... the thread is for a d17).. then you need to have a cat in there somewhere to make it legal, and O2 sensors connected. After that it just needs to be under the dB limit for noise your car is allowed to make. If all that is taken care of, its legal.