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Old 01-27-2008, 01:15 PM   #1
jordan s
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Default 2.5i header question

i've read a lot about how theres 2 cats in the header.... has anyone ever tried gutting them? or is it just easier to custom fit borlas or whatever?
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Old 01-27-2008, 01:41 PM   #2
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all i know is that on my 06' i didnt have any cats in the header. there is a seperate cat pipe connected to your header. i have a sedan but i really dout that they would make them completely different. i have a borla header w/ 2.25in header back pipes with a stromung type xa axle back.
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Old 01-27-2008, 01:56 PM   #3
jordan s
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hmm everything i've been reading lately says theres cats in the header..... where are they getting this from then?
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Old 01-27-2008, 03:04 PM   #4
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Quote:
Originally Posted by bsikora View Post
all i know is that on my 06' i didnt have any cats in the header. there is a seperate cat pipe connected to your header. i have a sedan but i really dout that they would make them completely different. i have a borla header w/ 2.25in header back pipes with a stromung type xa axle back.
hey, could i ask where you got your borla headers. I have looked and all i could find are na headers for up to 05, and i have an 06.

thanks
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Old 01-27-2008, 03:08 PM   #5
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i think he has the 05-previous borlas and an 05-previous style cat pipe which makes it fit the rest of your exhaust on your 06 (and 07's) at least that what just about anyone with an 06-07 has to do to get any headers since no one makes any to fit the OEM 06-07 flange locations yet.
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Old 01-27-2008, 03:10 PM   #6
zacks62fairlane
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oh... cool.

appreciate it
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Old 01-27-2008, 03:16 PM   #7
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so it needs no retrofitting then, just the 05 headers and the 05 cat pipe, and bolt them to the rest of my existing oem exhaust? sorry to ask the question again, this is just the first strait answer i have gotten on this subject.
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Old 01-27-2008, 03:21 PM   #8
RaceFaceXC
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thats what i understand to be true and the TWE and Stromung guys explained it to me that way, also. I hope thats the case cuz i have a TWE and Stromung setup going on soon and it better fit or ill ****.
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Old 01-27-2008, 03:33 PM   #9
jordan s
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Originally Posted by zacks62fairlane View Post
so it needs no retrofitting then, just the 05 headers and the 05 cat pipe, and bolt them to the rest of my existing oem exhaust? sorry to ask the question again, this is just the first strait answer i have gotten on this subject.
you have to lengthen the O2 sensor wire or so ive read. search the forum, theres so many threads on it.
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Old 01-27-2008, 04:03 PM   #10
zacks62fairlane
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that right i did read that one. so is it a simple splice, or more indepth than that?
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Old 01-27-2008, 04:04 PM   #11
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or maybe i should just go back and read it, right.
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Old 01-27-2008, 04:45 PM   #12
jordan s
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anyone gonna answer my question? or just turn it into a borla thread?
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Old 01-27-2008, 05:19 PM   #13
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Theres a cat in the header, which makes its official name "exhaust manifold"

Theres another one in the cat pipe, right after the exhaust manifold.

If you do a pre-05 retrofit with borlas, you will only have one in your cat pipe, unless you get a track pipe.
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Old 01-27-2008, 08:56 PM   #14
96SubyImpreza
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Quote:
Originally Posted by jordan s View Post
i've read a lot about how theres 2 cats in the header.... has anyone ever tried gutting them? or is it just easier to custom fit borlas or whatever?
Just my opinion but gutting an exhaust manifold usually makes your car sound like a tin can ricer...I'd assume this is true because it leaves a big nasty resonating chamber left in there.... I chopped my rear cat out completely and mounted a 3'' to it... fronts still in there.. no rice.

If I were to take the front out I'd probably get more power but i doubt even my butt dyno can tell the difference.

This is kind of ranting.... didnt answer any questions, just some info. sorry. hahaha
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Old 01-27-2008, 09:05 PM   #15
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I want to say there is a cat on the 06-07 "header" with two O2 sensors One immediately before and after the cat. I dont think the second cat located next to the transmission has any O2 sensors associated with it. If that is indeed a cat at all. it looks like one. In my car i see in front of the engine located on the passenger side, the "header" has two O2 sensors before and after what looks like a cat. I dont see any other O2 sensors anywhere else. So if you get a borla it looks like you will need to get O2 sensor extenders to get to the cat section you will need from an 05 type cat which will be located near where your rear cat like thing is right now (next to the tranny). As for your question, i dont know how you could "gut" your cat without cutting your OEM "header" to get inside the cat with some type of cutting tool. Just get the borlas already.
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