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Old 02-11-2008, 09:54 AM   #26
guciodog11
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Originally Posted by skribblez32 View Post
Can you please stop posting incorrect information.

The 2nd "cat" that you're talking about is a resonator. It is part of the mid-pipe of the car. There are cats intergrated in the header, not the mid-pipe.

If you're going to use that resonator, it's going to be like a track-pipe. Which will probably get you a CEL if you don't mod the O2 sensors.

The STi and WRX headers "bolt" up to our engines because it's for a 2.5 dual port block. That's where the similarities end. The exhaust routing is totally different.
1. no one needs cats. thats why god gave us MIL eliminators.
2. explain how the exhaust its totally diferent when i bolted in a 3inch TURBO catback to my stock everything and it fit PERFECTLY. The only difference is we have a midpipe instead of an up-pipe, turbo, and downpipe.

IF you don't know, 95% of subaru parts bolt up with no problems. my friend has a 2.2t with the 2.2 block, wrx heads etc and it works perfectly, so no one needs to make parts specifically for our cars to make them work
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Old 02-11-2008, 10:55 AM   #27
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Lay off the flaming in this thread.
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Old 02-11-2008, 05:13 PM   #28
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so i dont want to start anything here, but i think he might be on to something with the wrx header with no up-pipe

the angles look the same and length to end. He might be right
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Old 02-11-2008, 05:24 PM   #29
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Originally Posted by JLW2007RS View Post
so i dont want to start anything here, but i think he might be on to something with the wrx header with no up-pipe

the angles look the same and length to end. He might be right
Judging by those pictures, it does look like that. I do not want to even bother getting into a turbo exhaust though.
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Old 02-11-2008, 09:02 PM   #30
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It's been done before, there's a thread on it about a member using a wrx header on his 2.5i. It just requires welding, modifying the actual header, and other pieces (cat or track pipe).
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Old 02-11-2008, 09:08 PM   #31
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Originally Posted by JLW2007RS View Post
so i dont want to start anything here, but i think he might be on to something with the wrx header with no up-pipe

the angles look the same and length to end. He might be right
The OEM WRX header collector doesn't aim straight back like the OEM 2.5i header or that aftermarket WRX header. I have an OEM WRX header on my car, and the collector pointed upwards where the uppipe would bolt on. It required some cutting and modding to mate up to my stock catpipe. Sorry for the threadjack!

EDIT: Oh yeah, the 2.5i header has a 3-bolt flange...and the WRX header has a 2-bolt flange
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Old 02-11-2008, 10:19 PM   #32
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hmmm i have an old cast iron header from a 2.2t lying around somewhere that looks identical to the ebay header, only its 2 pipe instead of 4. ill hook that up to the stock midpipe and my catback and post up some pictures, prob this saturday or sunday. school's keeping me busy

@ semaj- thats interesting. look at the gaskets that come with the ebay header...3 bolts. or do u mean the flange that connects to the midpipe?

Last edited by guciodog11; 02-11-2008 at 10:25 PM.
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Old 02-12-2008, 02:22 AM   #33
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Not that anyone asked for it, but here's what everything is on the stock 07 exhaust. Yes those are the cats, look in your owners manual if you don't believe me. Yes it's a 3 bolt flange if 3 comes after 2 but before 4.

I got paper towels in the o2 sensor plugs and tape over all the other holes so bugs don't decide to make themselves a home in those pipes.



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Old 02-12-2008, 04:23 AM   #34
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Quote:
Originally Posted by guciodog11 View Post
1. no one needs cats. thats why god gave us MIL eliminators.
2. explain how the exhaust its totally diferent when i bolted in a 3inch TURBO catback to my stock everything and it fit PERFECTLY. The only difference is we have a midpipe instead of an up-pipe, turbo, and downpipe.

IF you don't know, 95% of subaru parts bolt up with no problems. my friend has a 2.2t with the 2.2 block, wrx heads etc and it works perfectly, so no one needs to make parts specifically for our cars to make them work
yea.. for tubro models to turbo models.. and NA to NA... this is not nearly as simple as you propose.. there is a lot of mods to the WRX header to make it work.. and the 2.5 cat back is too short to reach the WRX header.. the Op's method is the best way.. lets stay on topic.. turbo parts on our cars is foolish..
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Old 02-12-2008, 02:41 PM   #35
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what kind of mods?

I understand you need to mod the crap out of a regular rex header to make it work, for something like this: http://cgi.ebay.com/ebaymotors/Exhau...spagenameZWDVW

but not for the header i posted.
No modding needed, its gonna fit.

ill prove you guys wrong this weekend anyway so theres not point in arguing.
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Old 02-12-2008, 03:18 PM   #36
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gucciodog, are you going to put that header on? i would like to know what happens, because it looks like it would fit, maybe im being dence
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Old 02-12-2008, 07:09 PM   #37
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gucciodog, are you going to put that header on? i would like to know what happens, because it looks like it would fit, maybe im being dence
i really want to, but i dont have the money/time to do it.

maybe late spring when i get everything together ill slap it on and show you guys. for now, ill just do a test fit on the ground with a 2.2t cast iron header ( which looks almost identical to the header i posted, plus its from a turbo) stock cat and midpipe, and the 3" catback i have. Ill post the pics up this sat or sun. Its not gonna be on the car, but at least we can get an idea of what needs/does'nt need to be done to make it fit.
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Old 02-12-2008, 08:41 PM   #38
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sweet thanks, is the cast iron thing the same size fit and angle?

Last edited by JLW2007RS; 02-12-2008 at 08:41 PM. Reason: spelling
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Old 02-12-2008, 09:17 PM   #39
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Just remember, if you are to use those headers, you will need to drill holes in your cat pipe for the O2 sensors (and get in the thing for it to screw into), and get a new flange. The stock cat pipe is a 3 bolt flange, not 2.
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Old 02-12-2008, 09:36 PM   #40
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Old 02-12-2008, 09:51 PM   #41
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Nice! Now it looks like all you have to do is add the second O2 sensor.

Well, I like having a high flow cat
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Old 02-12-2008, 10:07 PM   #42
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Zepplin, if it werent for you i wouldnt even bother trying this, you have really opened the door! are you kicking any CEL's? and do you think i could wire both 02 censors to one?
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Old 02-12-2008, 10:25 PM   #43
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Zepplin, if it werent for you i wouldnt even bother trying this, you have really opened the door! are you kicking any CEL's? and do you think i could wire both 02 censors to one?
This would be pretty illogical IMO.
To my understanding, the first O2 sensor sniffs the exhaust before the catalytic convert and goes "it has this much emissions in it". The second one, after the cat, sniffs it and makes sure its less. If not, then the catalytic converter has generally failed and your CEL goes off.

I heard something about Borla UEL headers pushing out air faster, thus causing the CEL to go off. But, as I have said in my how to, my CEL has not gone off.

Well, it did, for the day when I had no O2 sensors hooked up. After that, it was fine.
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Old 02-12-2008, 10:33 PM   #44
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where would i put the second o2 in?
do you think you could get a few more vids up of yours? maybe from a little further away and a driving one? ill probably just end up doing borla with RS catback. Can you still get your oil filter out?

Last edited by JLW2007RS; 02-12-2008 at 10:34 PM. Reason: information
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Old 02-12-2008, 10:50 PM   #45
ZeppelinPie792
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where would i put the second o2 in?
do you think you could get a few more vids up of yours? maybe from a little further away and a driving one? ill probably just end up doing borla with RS catback. Can you still get your oil filter out?
Somewhere after the catalytic converter on your cat pipe.

I will get some more videos up soon, but will not be able to in the next two days due to work.

I addressed the oil filter question in my original post.
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Old 02-12-2008, 11:01 PM   #46
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nobody likes to read it seems.. they just ask questions and be fat, dumb and happy like nothing else matters. is it really that hard to read 3 minutes worth if useful posts? far easier than posting a question and waiting a day for a response. Sorry, its just very annoying reading the same stupid question asked over and over.
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Old 02-12-2008, 11:10 PM   #47
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i cant believe you felt the need to post that, ill stick to PM's next time and sorry i ruined the thread by talking to Zepp
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Old 02-12-2008, 11:43 PM   #48
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and sorry i ruined the thread by talking to Zepp
I don't really see how this thread can be ruined. The only thing people are really going to read is the first post. If there are any posts afterwards that pertain (if I spelled that right) to my how to, I will go in and edit the first post as needed.
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Old 02-13-2008, 02:19 AM   #49
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so if that second cat is AFTER the O2 sensors then you can remove it or gut it and not get any CELs?
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Old 02-13-2008, 03:11 AM   #50
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so if that second cat is AFTER the O2 sensors then you can remove it or gut it and not get any CELs?

Seems pretty logical.

Go for it.
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