Rep Power: 319

Just wondering about downpipes for the ex. I have a dx sedan, but i want to do the ex conversion. I have the dc headers already, and i am having a hard time finding out about the downpipe. Ive seen a couple off ebay, but i wanna make sure that they have o2 sensors both before and after the cat, so that i wont need an o2 simulator. Also if anyone has done this swap on a dx do i need the ex sway bar? Ive tried searching but didnt find much. Sorry if this is a repost.

 
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The HKS downpipe on ebay has both the sensors and is a good fit.

 
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aight cool....i saw that one on ebay, but it doesnt show a picture of the second sensor hole. I also tried looking on the hksusa website and i didnt find it there either. Are there any other companies that make them? Ex sway bar?

 
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you can get Random Technology Cat for EX...but then since you have DX, you have to extend the inlet pipe 1feet longer to avoid hitting the front sway bar...also, there are two holes for the sensors

OR you can get the universeral random tech cat and find a shop to weld it on the car...

 
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okay so the random tech cat for the ex has the downpipe also? Does a dx ever have a stock sway bar? It is base model yah know!!
Extend the inlet pipe, whice pipe is that?

 
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you didnt find any info about that downpipe on the hks website because that pipe on eBay isnt real hks. take a closer look, it says its made by hks-a or something like that. i also though there were some members on here who had that downpipe and it didnt have the o2 sensors. could be wrong, but may be worth looking into.

 
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downpipe refers to the cat...

the shop will know the exact location to extend while installing the cat...

 
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I got an LX Sedan and I went through the trouble with converting it to a semi EX with my HP headers. Now I'm getting the SFPower Turbo and am grabbing the EX kit so I don't have to cut/weld anything.

I got that HKS-A Pipe in the mail the other day and it does have 2 holes for the O2 sensors (one at the end where the EX Header downpipe connects at & one at the end where the Exhast connects at) It doesn't come with any O2 sensors so you will either have to legnthen your existing sensors or do what I did and buy a set of EX sensors from (www.hondaautomotiveparts.com).

From my experince with my HP Header 4-1 w/ racing cat you will need to replace the front sway bar to fit the cat underneath. If you were to look at both sway bars side to side the EX sway bar has a little upward bend in the middle to clear the cat.

Now you are getting the DC Headers, which I believe are the shorty headers (just the top piece) if you look at the difference in exhaust systems in the Honda Shop Manual between the DX/LX & the EX models, the whole exhaust system is completely different. The DX/LX has the top header/cat under the hood attached together then the exhaust piping right below, while the EX has the top header piece, a second piece of piping going to the down pipe, then the downpipe/cat, then the exhaust.

So if you are going to convert it to an EX exhaust system you will need the piece of piping going from the bottom of the header to the downpipe/cat.

If I am wrong please correct me. If I had a camera I'd take pics of the honda service manual, and if I wasn't at work I'd like to the small pictures of the exhaust system on hondaautomotiveparts

 
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I used to have that ebay hks-a downpipe, it was allright but you had to have the o2 simulator because it only had 1 o2 bung up under the header. it bolted up fine, no fitment issues. It seemed like it opened up the air flow a little, but it made my car louder and it smelled bad since there was no cat. Anyways I sold it, I have the random technology cat on order so we'll see how that works out.

 
Rep Power: 319

okay yah i though that i only saw one sensor bung in the hks-a one of ebay, but when i asked the seller he said that there was two!? Is he lying to me. Basically i want to do this the easiest, and less complicated way. I want to get the exs downpipe....bolt it to the header...then to the midpipe, but now i need the ex sway bar....how much do those go for?

 
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yeah that seller told me there was 2 and i got and there was only 1, i was like WTF?!?!? anyways, it worked OK with an o2 sim, but I got my random tech cat last night, so I'm gunna just put that on...

 
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tell us how the random technologies cat fits

 
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idq: yah id like to know how that works out also.

 
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i'm gunna post it ASAP.. it sucks because i tried putting it on last night and the bolts on the stock cat were so rusted, I couldnt even get a socket on there, I sprayed them down, everything I could think of, and nothing worked, I was so pissed... I'm gunna try working on it again this weekend when I have more time....

 
Rep Power: 319

yah sometimes the only way to get them off is too cut them. But good luck. How much was it anyways?

 
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get something called PB Blaster, its like wd40 x 10000000

it will melt a cup in about 2 mins, it works great, i wont use anything else when it comes to removing rusted bolts, etc

 
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I got it off the group buy center... I paid 240 for the cat, 17 for the bolts/gaskets, and 15 for shipping... here is the guys email and website if anyone is interested:

his name is John
sales@civicshop.com
www.civicshop.com
(718) 288-1390
M-F 10am-5pm Eastern.

 
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aight cool...and this is the radom tech one right> has both o2 sensors??

 
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yeah its got both o2 sensors.. I guess it for the EX only, it looks like it should fit because it has the same basic shape of the stock one, damn... I gotta get those bolts off.. maybe i'll try again tonight when I get off work...

 
Rep Power: 319

aight cool...just let us know how everything works out....i really need to get these headers in...but money is kinda tight!