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Old 09-04-2007, 01:17 PM   #1
nismo4life
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Default EJ22 interchangability

Do you guys know what exhausts (catback or axleback) off what year sti's will fit onto a 97 obs 2.2? And if there are any good companies that make headers?
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Old 09-04-2007, 02:42 PM   #2
renyo
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Search much?


That being said..

I'm pretty sure most WRX and STi exhausts will fit on it with light modification--I think the midpipe needs to be extended and the flange rotated. Could be wrong about the midpipe though.. Not sure about STI exhausts though.. (hell, Subaru capitalized the I, might as well use the difference for something.. )

As for the headers, you said it's a 97 2.2L so I'll assume it's got a single port heads.. so you can choose between Borla, Borla, and Borla..

Last edited by renyo; 09-04-2007 at 02:43 PM. Reason: too lazy to read the preview post before hitting submit / grammer
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Old 09-04-2007, 10:28 PM   #3
PhilSine
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Quote:
Originally Posted by renyo View Post
Search much?


That being said..

I'm pretty sure most WRX and STi exhausts will fit on it with light modification--I think the midpipe needs to be extended and the flange rotated. Could be wrong about the midpipe though.. Not sure about STI exhausts though.. (hell, Subaru capitalized the I, might as well use the difference for something.. )

As for the headers, you said it's a 97 2.2L so I'll assume it's got a single port heads.. so you can choose between Borla, Borla, and Borla..
An 02 turbo-back (used as a cat back) is what I put on mine even before I used the rest of it to turbo it.

As for headers...have patience and I'll likely announce soon that I may be having a local exhaust shop fab up some Borla replicas that are thicker and with bigger tubing. Borlas are a bit small. I'll be shooting for a 2.5" exit on mine that will bolt to the OE flange.
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Old 09-04-2007, 11:11 PM   #4
Storm
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PhilSine:
I'm finding that 2" primaries into a 2.25" collector is showing ZERO signs of torque loss in the lower RPM and never seem to run out of breath in the upper range. The cams poop out first. Food for thought. I really need to hit those exhaust ports with an airgrinder to see what happens......I gotta wait for some 99 or newer heads to find their way into my hands first.

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Old 09-05-2007, 01:19 AM   #5
PhilSine
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I was thinking about a 2.25" collector but I also know that those that upgrade cams and such might want a 2.5" collector.

The 2" primaries are likely but I might use 2.25" due to the fact that nobody in my area has a mandrel bending machine. With the crush bend, its the same as reducing to 2" when it hits the corner.

My other option would be to hit up an exhaust shop a few hours south of here that has a mandrel bending machine. Then I could use 2" primaries and have them come together in either 2.25" or 2.5" collectors.

One more option would be to have a run of both made.
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Old 09-05-2007, 02:57 AM   #6
Storm
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The only thing I can see about going that big on the primaries would be the port only being a smidge over 1.5" ID. That's a big step right there at the flange.....I wonder what would happen to the flow characteristics with such a big step up so close to the valves.

If you were to go that big....I would definately look into having the primaries sliced in half and welding in a divider wall (think twinscroll) that would run down somewhere around 12-14" from the flange. Having that same wall extend into the port to divorce it would further extentuate the effect. I'm thinking the scavenging effect would show an enormous benefit in overall performance.

I wanted to do this on my header project, but my enthusiasm greatly outweighs my fabricating skill. I still plan to try it in mild steel at somepoint.....but someone more knowledgable could possibly create something very good compared to the OEM setup.

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Old 09-05-2007, 09:46 AM   #7
PhilSine
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I'll research smaller tubing at the port vs. larger and see what I can learn. I'm not sure if it will make a difference but that's what I now aim to find out.
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Old 03-03-2008, 09:55 PM   #8
alejo
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does anyone have a picture of a single port header? I still don't understand how can you fit a 2" tube on the primaries? does that mean that the primaries will be right "inside" the headers? any help would be appreciated, thanx a lot
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Old 03-04-2008, 11:50 PM   #9
Kansei
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I'm lost altogether... what are single port heads? and what are the primaries? and what is an OBS? by the way I understand I am very slow....
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Old 03-05-2008, 12:23 AM   #10
rivman05
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Ok, OBS = Outback Sport, as for the single and dual port heads, well thats what makes the difference since the bottom sides of the heads either have one or two holes for the exhaust to go out from. dual port heads are common, but singles seem to show up often. In regaurd to headers, I'll post a few links to follow.

http://www.borla.com/applications/lo...LHeader/17183/

and

http://www.autocarparts.com/part/list/1206/

these are the sites ive found for headers.
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