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OK from what I understand is that on my LX the cat takes up the bottom part of what would be a header on the EX, and the EX cat is further down almost under the car, could I buy an aftermarket header and Exhaust for the EX, and the EX OEM cat and hook it all together, and plug in my O2 sensor into the EX cat?

 
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doesn't sound like a bad idea... but as i understand.. that would still be illegal... might as well swap it out for a hi flow cat instead... oem parts are expensive.. =(

 
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i remeber someone said you also need the ex front swap back, because the lx sway bar is at a difference position

 
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heres the LX exhaust manifold system.



and heres the EX manifold system.



and here are the downpipes, the EX with the CAT and the LX without one

I want my car to stay legal, with all the cats in place, but I dont see how switching the location of the cat would matter or how they would know when inspecting in the first place. I just want to know if this is feasible.


Oh and if it is I would love to buy a persons who has a hi flow cat EX OEM downpipe, CAT, and the two O2 sensors.


Also another technical question, Why would the engineers bother making different headers for the EX and the LX? From what I knwo the closer a Cat is to heat, the faster itll heat up and start working, so why did they only put it right under the header on the LX?


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probably something to do with the vtec and non-vtec maybe they needed more room for the gas to mature.. i don't know what i am saying. and update your lj

 
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You know what I think is also weak, why did Honda use K20 in the Si? they used a b16 in the 6th gen Si, so why not make a b17 for the new Si?

 
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i don't think the 16 was for generation, instead i think it meant 1.6 liter, like the b18, 1.8 liter. so the next logical spet should be a b20, a 2 liter, but now they got i-vtec, so why not put i-vtec into use? bam, k20 :-)

 
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no i mean they used d16s in 6th gen civic LX and EX, and then for Si they popped in the B16, they didnt put ina b18 from an integra base, but for the 7th gen which for EX and LX use d17s they put in a K20, which is mor elike the RSX(integra) base, I just think its kinda weird. Honda getting lazy, I think the swap would be easier from new Si to EX or LX or DX if the Si used a b17 motor instead of the k20. Just my 2 cents.

 
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i seriously don't think honda cares about how it makes your life easier to swap engines. what matters to them is the lower production cost. it's not like everyone that buys a honda is going to swap the engine.

 
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Make a note that this would be for 2002 and up, if you're worried about the sway bar. 2001 LX doesn't have a sway bar...

 
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2001 LX,DX doesn't have a rear sway bar, but they do have a front one...same as EX, because I don't think the rear one will have clearance problems...but not sure

 
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I'd really like to do the lx/ex exhaust and header switch. If anyone can figure this out and find out exactly what parts are needed (I'm lazy as hell) I'd appreciate it.

 
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That convertion has being done

The only part that you'll have to worried about is the second stage of the exhaust system right after the header, after that a good muffler shop can build a custom tubing to the back.
The factory tube is too small and you'll need a 2.75" tube to make the flow better and take advantage of the headers.
Another thing you'll have to do is to make an extention harnes for the secondary O2 sensor and placed right after the high flow cat. As soon as you remove the factory cat, your car will officialy be illegal so therte is no way arround it. (everything is legal till you get cut)

Click here for more pics 2k1 LX

GOOD LUCK

 
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Supermex has a ex header and exhaust. I believe all he had to do was extend the sensor cables to reach the sensor holes and everything else was plug and play. I think he has the dc header but I forgot what exhaust he has.

 
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Opps, you beat me Hector. [IMG]i/expressions/face-icon-small-tongue.gif[/IMG]

 
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Yeah, the front sway bar is the same in the DX/LX/HX/EX. For short, in all models. No problem there. Also, the DX/LX has the cat integrated into the header because they wanted to lower the emissions. Since the DX/LX has no VTEC, the camshaft is probably more aggresive and uses more fuel and air than an EX/HX. That's why they wanted to reduce the emissions. Or maybe it's not more aggresive, but the fact that it doesn't get more aggressive at higher rpm's means that the engine isn't as efficient in combustion. Therefore, they needed to clean up the air a little more than was necessary on the EX/HX.

All you really need is an EX cat-back, a high flow catalytic converter, EX headers, and a downpipe. You could use the stock downpipe, but that would be crazy. Just get a muffler shop to make you a custom one out of larger diameter tubing. Then just extend the 2nd oxygen sensor by cutting the wire and extending it. No problem.

 
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ULEV

 
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Is thre a place in the hi flow cat to plug in the o2 sensors and also, i dont see what the problem is with getting the EX cat? And the car would still pass inspection. Also I dont want the engine check light to come on.

 
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Good question, I don't know exactly. Although if you look at the LX's setup you'll see a sensor before the cat and one after the cat. The one before the cat is covered with an EX header. I guess that an EX exhaust system has the one after the cat? Can anyone confirm?

 
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the o2 port should go after the Cat for the computer to get the before and after gas/air reading.
Muffler shop can burn a hole into it the pipe and weld the nut that holds the o2sensor.
Is up to the shop to give ya a clean bill of inspection, we don't have Inspections in Florida so it is not a factor for us here,but LX/DX/HX are ULEV designated automobiles and for all practical propurses is cosider illegal to modify the exahust (specialy in California)
My suggestion is to make friends with the inspection shop $$$ [IMG]i/expressions/face-icon-small-wink.gif[/IMG]
The engine light will not come on unless you start your engine before the job is complete, all sensors will have to be correct, make sure you mark the front and back sensors so you won't place them in the wrong port, if the engine light goes on disconect the battery for about 10 minutes. See DYI


Every mod is rice to you when you drive stock

 
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Oh really? One of the people on our team did that to his 7th gen (LX to EX exhaust conversion) and he had to replace the LX front sway bar....

 
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Well, if you go on www.hondaautomotiveparts.com and look at "knuckle" for the LX and EX you see the same picture. The same size front stabilizer bar too (25.4MMX4.5). Although they do have different part numbers. 369000 for the LX and 368999 for the EX. If you look at the DX it has a part number of 369000 too. Hmm... You may be right. Oh well, I'm planning on upgrading to a 22mm rear sway bar from Progress and their 27mm sway bar for the front. That's designed for the EX, so I shouldn't have any problems.

 
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That sway was not even an issue for me I did my convertion the first month when I got my car about a year ago.
No problem since and my car is really low.

 
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so my question is, if the ex o2 sensors were purchased, would they reach where they're supposed to go on the ex exhaust, and still plug into the harness where the dx/lx plug into?

i'm not that worried about emissions, I just want to have a more efficient exhaust for my nitrous install.

Or would just a cat-back be enough for the nitrous, like a 50-70 shot?

 
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Hmm... Good question. I don't know, but why not just extend the sensor wires. All you have to do is cut the wire, solder on an extention, or clip on and extention, and you're ready to go.

 
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2.75 is way too big. -stock is under 2" so up it to 2.25 or 2.5, any more and you will lose performance.

 
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They made that crappy restrictive header for the LX to degrade the performance so that they could diguise ther fact that the vtec on the EX does nothing.