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I can't find downpipe angled for an evo o2 housing

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housegsx

20+ Year Contributor
2,455
44
May 28, 2004
Greensburg, Pennsylvania
So, does anyone make such a downpipe, preferable with the option for a cat and that is 3 inch? Also that bolts up the apex n1 catback. And don't tell me RRE, I'm looking for others.
 
Honestly, RRE is the only vendor I've ever seen carry these. If you can't find them from someone else, you can always persuade your 2G downpipe to work with the EvoIII housing. I just filed the bolt holes until they were wide enough to fit onto the studs on the housing, threw on an appropriately sized gasket, and bolted it up. You might have to file the holes at the catback end also, as the bend in the pipe needs to be clocked slightly from the 2G configuration. Good luck.
 
Yeah, it just sucks because I purchased an evo o2 housing and I'm stuck looking for a downpipe to just bolt right on. RRE is the only company that seems to make them in this configuration, but they're not taking my order.
 
You said no Road/Race suggestions, but to my knowledge they're the only company that makles a downpipe angled for the EVO O2 housing.
 
My VRS i have now and my Apex GT i used to have bolted up fine. VRS can be used with testpipe/cat but the Apex is cat delete.
 
I'm good now. RRE finally shipped my downpipe and cat so now I can breathe easy.
...Now if only my turbo was here.
 
I'm running an evo 3 02 with an apexi downpipe. It was hard to bolt on but i made it work and it doesn't rub the driveshaft or anything. If you have a downpipe, just fight with it to make it work :)
 
Just bought my own RRE "Evo Style" DP that accomodates for the angle difference. If anyone cares to see some photos, just ask. Unfortunately, I don't have anything to compare it to (except for the OEM DP, when I take it off), but at least you'll see the angle difference and can compare it to your own or other people's photos. BTW I won't recieve it for about a week due to shipping distance.

Does anyone know why the second section of their DPs are made up of aluminized steel piping (while the first half, before the flex section, is made up of stainless steel)?
 
Yeah, i just found out mine shipped yesterday so i should have it early next week. I wish the whole thing was stainless too, but downpipe options are limited. I ordered mine with the high flow cat as well. I'm going make my own test pipe for when I want to switch it out.
 
housegsx said:
I ordered mine with the high flow cat as well. I'm going make my own test pipe for when I want to switch it out.











I was going to order the "short" version of the DP, but RRE sells them at the same price, and then it would be another $60 just for a TP. Skipped all that BS and just went with the "long" version. It would have been easier for me to be able to switch the catalytic converter in and out when inspection time comes up every year, but I guess I'll deal with the hassle when it presents itself.
 
I have a Megan Racing downpipe and I wish I had known it was the Evo O2 profile before I tried installing it. I would have bought a different O2 housing (I have the SSautochrome dumped). It was a total bi*** to bolt up, and is tweaked a bit.
 
Man rre is great! I was posed with this same problem ... i had my local exhaust shop make me a 3" exhaust from the flexpipe back for $70, it would have cost a lot more to have them make the first bend and flange to bolt up to the o2 housing, so what did i do? called up RRE, they were kind enough to give me the # of their fabrication shop who worked out a deal with me to just make the "first bend" of the downpipe, angled correctly for the evo3 o2 and i went back, bolted it up and got it welded together. all in all it saved me a bunch of money.

Thanks RRE for years of great service and having everything for a dsm but just not listing it on your site!
I gotta give props to Dejon as well because they have made one off parts for my car in tight situations before as well!
 
I was going to order the "short" version of the DP, but RRE sells them at the same price, and then it would be another $60 just for a TP. Skipped all that BS and just went with the "long" version. It would have been easier for me to be able to switch the catalytic converter in and out when inspection time comes up every year, but I guess I'll deal with the hassle when it presents itself.

x2

I've got the Road/Race cat-delete "long" version too. Good fit, finish, and sound. Oh, and out here in the vast planes of Illinois there is no emissions testing. Just one less thing to worry about.
 
All you need to do is make sure the flange is "slotted" and it will compensate for the angle of the Evo O2. I have seen/heard different expeiences from vendor to vendor, and the only problem may be putting too much stress on the flex section. But i know numerous friends who have been running it that way for 2 years without a single problem.
 
The article doesn't particularly concern those of us who are installing (or want to see) the RRE DP with the angle difference, but Kyle has done a decent install guide here for the RRE "Short" DP and test pipe. From what I can tell, the angles look the same, and thus would lead me to believe he purchased and installed the "regular" DP that bolts right onto the 2G OEM O2 housing. (See the photo he took comparing the OEM DP and the RRE DP here.)

I just sent him a PM so he can join in the conversation just in case he would like to add anything. But as far as the install goes, it can't hardly be any more straightforward than this.
 
I was just curious, about the comment of the DP's not being SS after the flex section? Is this true for all the models & is this something they just recently started? I bought my fwd short pipe used 3 or 4 years ago now (& don't know how old it was when I bought it) but I was always under the impression it was SS all the way back & I can say it still doesn't have a spot of rust on it, so I would think it is in fact SS. Only thing I have had wrong with it, is the flex section went, but it was broken when I received it (probably bad motor mounts on previous owners car). Got a new one welded in & its been great. Fitment is excellent as well.

Actually now that I think about it I'm pretty sure its SS the whole way, as I had a beverage machinery welder, weld a WB bung in after the flex section & he did comment that it was SS but not the greatest quality (but I would imagine he's use to pretty high quality being in the beverage machiney industry).
 
Erik (and to anyone else who may be interested), this thread may interest you (even though some of us have already made our purchase).
 
daren_p said:
I was just curious, about the comment of the DP's not being SS after the flex section? Is this true for all the models & is this something they just recently started? I bought my fwd short pipe used 3 or 4 years ago now (& don't know how old it was when I bought it) but I was always under the impression it was SS all the way back & I can say it still doesn't have a spot of rust on it, so I would think it is in fact SS. Only thing I have had wrong with it, is the flex section went, but it was broken when I received it (probably bad motor mounts on previous owners car). Got a new one welded in & its been great. Fitment is excellent as well.

Actually now that I think about it I'm pretty sure its SS the whole way, as I had a beverage machinery welder, weld a WB bung in after the flex section & he did comment that it was SS but not the greatest quality (but I would imagine he's use to pretty high quality being in the beverage machiney industry).








Just emailed them about this question. BTW, in case anyone is wondering what is being refered to, I will take the liberty to quote RRE from this link.



RRE said:
Our DPs have a 2 1/2" stainless steel first bend with a 2 1/2" stainless steel flex section. They then expand to 3" right after the flex section right under the oil pan area. Why start out at 2 1/2"? If you are running on the stock O2 sensor housing, even ported it is 2 1/2" inside diameter. When the exhaust gasses are hot, they flow better, 2 1/2" is plenty for the first 12". As the gasses cool , bigger helps. By going to 3" after the flex section, we allow this expansion and also allow for better clearance at the front where room is tight. From there they are a full 3" back to the Apex 3" flange with 14 gauge aluminized steel piping. We had some Apexi flanges laser cut out of thick 1/2" steel for a good seal and fit.
 
The article doesn't particularly concern those of us who are installing (or want to see) the RRE DP with the angle difference, but Kyle has done a decent install guide here for the RRE "Short" DP and test pipe. From what I can tell, the angles look the same, and thus would lead me to believe he purchased and installed the "regular" DP that bolts right onto the 2G OEM O2 housing. (See the photo he took comparing the OEM DP and the RRE DP here.)

I just sent him a PM so he can join in the conversation just in case he would like to add anything. But as far as the install goes, it can't hardly be any more straightforward than this.

Yep I did purchase the regular style RRE downpipe that would fit on our stock O2 housings. Fitment was unbelievable. It was a breeze.
 
My 3in mandrel dp touches my transfere case pretty snuggly from the angleing of the evo3 o2 housing and causes a horrible vibration noise thruout the car, therefore I have been using a crow bar to pry it off the tc a inch and then stuffing headerwrap between the dp and the transfere case hopeing for it to absorb some of the vibrations versus the metal to metal contact... It definitly doesnt vibrate or make as harsh noises ever since I did that... One day I may just go with a tubular 3in o2 ext w.g. o2 housing or something fancy for when i start looking into fp3052's or something...
 
daren_p said:
I was just curious, about the comment of the DP's not being SS after the flex section? Is this true for all the models & is this something they just recently started? I bought my fwd short pipe used 3 or 4 years ago now (& don't know how old it was when I bought it) but I was always under the impression it was SS all the way back & I can say it still doesn't have a spot of rust on it, so I would think it is in fact SS.












Recieved a reply from Mike W. over at RRE. He said it was cost that made RRE change to aluminized piping for the second half of the DP (that is, to keep costs down, presumably both for the company and for the consumer). He also said that if the consumer really wanted an all stainless steel downpipe, then the consumer should look to add $60 and 3-to-4 additional days for RRE to make it. I suspect you would have to send a special email or specifically state this change on the "Order Form".
 
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