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gil_ong81
10-31-2005, 07:08 PM
first off, thanks to belladonna for pointing me in the correct direction.

i have been looking for a cat for a while now since my car came with a gutted cat.


poked around on ebay a bit, and came across these few choices. any ideas on if any particular one would work better than the others??

Catco (http://cgi.ebay.com/ebaymotors/2-25-2-1-4-Catco-Catalytic-Cat-Converter-NEW_W0QQitemZ8011255407QQcategoryZ33629QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)
https://sl-i.net/FORUM/images/imported/2005/10/54_1_bJPG-1.jpg
(this is what bella has, and IS what started this search in earnest)

Eastern (http://cgi.ebay.com/ebaymotors/Eastern-Catalytic-Converter-High-Flow-2-25_W0QQitemZ8010447664QQcategoryZ33629QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)
https://sl-i.net/FORUM/images/imported/2005/10/eastuniv-1.jpg

No Brand, But SHINY (http://cgi.ebay.com/ebaymotors/Catalytic-Converter-Stainless-Steel-High-Flow-2-25_W0QQitemZ8009817769QQcategoryZ33629QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)
https://sl-i.net/FORUM/images/imported/2005/10/Thunderbolt1-1.jpg

Carsound MagnaFlow (http://cgi.ebay.com/ebaymotors/Carsound-MagnaFlow-Catalytic-Converter-2-25-HF-FS_W0QQitemZ8010447916QQcategoryZ33629QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)
https://sl-i.net/FORUM/images/imported/2005/10/93509-1.jpg

sheepdog
10-31-2005, 07:48 PM
If i remember correctly, the high flow cat's two of the WRXs at ecb run is made by TurboXS, if I recall correctly. Could be completely wrong, Ill check. Anyways, whatever it is it works good.

gil_ong81
10-31-2005, 08:17 PM
sory sheep dog. you need to rephrase that.

all i'm getting is that 2 WRXs on ECB run cats by TurboXS.

is that the essence of your post? I dunno about TurboXS only cos of cost.

sheepdog
10-31-2005, 08:21 PM
Thats the gist of it. Sorry if that was unclear. Anyways, it was expensive, but they are good cats, and the cars pass inspection. It all depends on what you want.

Wiscon_Mark
10-31-2005, 08:23 PM
Stromung is completely bolt on. Goes from the headers to the cat-back (resonator). 350 bucks+shipping, and a few extra gaskets, so its around 400 bucks overall. Little pricey, but much cheaper than OEM (1000 dollars!!! :shock:)

Huffer
11-01-2005, 11:49 AM
Are you wanting an OEM replacement, or a hi-flow with bigger diameter pipe?

I bought an OEM replacement for $275 shipped, deleted the front cat and only uses the rear one...all gaskets and bolts.

gil_ong81
11-01-2005, 01:34 PM
Are you wanting an OEM replacement, or a hi-flow with bigger diameter pipe?


yeah. high-flow. 2.25" in and out to complement my MRT headers and midpipe.

Reason
11-03-2005, 04:34 AM
Get a Stromung high flow

gil_ong81
11-03-2005, 09:07 AM
Get a Stromung high flow

would love to, but that'd require me to replace the whole mid-pipe.

no have so much money, mon. :(

Huffer
11-03-2005, 11:19 AM
if you can't afford to replace the whole pipe, why bother? you'd have to flange the cat pipe to fit the bigger opening for the cat inlet, and then reduce it at the other side to match up with the 1.75" (if that) mid-pipe.

You ideally want to keep consistent diameter, or if you flange up, don't reduce down on the other side.

That'd be like a WRX going with a 3" downpipe and then reducing to 2" mid.

phi11
11-03-2005, 12:01 PM
https://sl-i.net/FORUM/images/imported/2005/11/Emmaaa-1.jpg
this is my cat back!!!!!

gil_ong81
11-03-2005, 01:08 PM
if you can't afford to replace the whole pipe, why bother? you'd have to flange the cat pipe to fit the bigger opening for the cat inlet, and then reduce it at the other side to match up with the 1.75" (if that) mid-pipe.

You ideally want to keep consistent diameter, or if you flange up, don't reduce down on the other side.

That'd be like a WRX going with a 3" downpipe and then reducing to 2" mid.

I currently have MRT headers and a 2.25" midpipe; the only stock item ont he exhaust system is the muffler. The cat was gutted by the previous owner and i want to install a functional one.

Huffer
11-03-2005, 02:18 PM
Cool!

In that case, get any old hi-flow cat that meets your needs, then have a shop fab up the correct pipes to match your header and mid-pipe.

With the gutted cat - are you getting a CEL?
Theoretically, the front O2 will read the same as the rear O2, so the ECU will think nothing has changed, and should give you a "Cat inefficiency" code.

gil_ong81
11-03-2005, 04:06 PM
Cool!

In that case, get any old hi-flow cat that meets your needs, then have a shop fab up the correct pipes to match your header and mid-pipe.

With the gutted cat - are you getting a CEL?
Theoretically, the front O2 will read the same as the rear O2, so the ECU will think nothing has changed, and should give you a "Cat inefficiency" code.

yeah, i do get a CEL (P0420). but almost exclusively from highway cruising. normal stop and go traffic, or when i'm on and off the gas, never had a problem. curious. isn't it?

Huffer
11-03-2005, 04:10 PM
Sort of - it probably has to do with a greater volume being pushed through.

Maintaining higher speeds requires more effort, whatever the RPM.
(unless you have 100% momentum tires :D )

Have you considered using a spacer on the O2 sensor (rear)? That would lift it out of the exhaust flow a little, might prevent the CEL.

Sorry, kinda OT there.

gil_ong81
11-03-2005, 04:17 PM
Sort of - it probably has to do with a greater volume being pushed through.

Maintaining higher speeds requires more effort, whatever the RPM.
(unless you have 100% momentum tires :D )

Have you considered using a spacer on the O2 sensor (rear)? That would lift it out of the exhaust flow a little, might prevent the CEL.

Sorry, kinda OT there.

considered and even looked into it. in fact, i have 2 of them drilled out and sitting in my desk at home.

looking under my car, it looks like i don't have enough clearance to mount one anyway.

besides, i kinda like the idea of not having my exhaust smell so bad when i'm sitting idling at a light or whatnot.

legacy92ej22t
11-03-2005, 04:49 PM
I have to give props to the Carsound-Magnaflow. I run one for emission testing (I run catless 11 months of the year though). Mine's a 3" of course but it works very well and doesn't effect the exhaust note too much.

gil_ong81
11-03-2005, 04:53 PM
think i might get better flow if i installed a 3" cat with 2.25"-3" couplers on each side?

legacy92ej22t
11-03-2005, 04:56 PM
No.

Wiscon_Mark
11-03-2005, 10:14 PM
The Stromung goes from headers to midpipe, and it has adapters built in so it will work with both 2.25" piping (what it actually is) and the stock 1 7/8s piping. This won't work for you Gil?

Huffer
11-04-2005, 11:05 AM
Is the stromung stainless or mild steel?

gil_ong81
11-04-2005, 12:48 PM
The Stromung goes from headers to midpipe, and it has adapters built in so it will work with both 2.25" piping (what it actually is) and the stock 1 7/8s piping. This won't work for you Gil?

it would, except i really don't see much point is getting rid of my existing midpipe for the sake of a cat when i can replace JUST the cat. it's like getting a new brake system all around when all you need is replace the pads.

besides i can think of lots of other things i could do with the additional $300.

Reason
11-04-2005, 02:09 PM
Why would you have to get rid of your mid pipe. Last time I looked you have the header, 2 cats, mid pipe and "axle-back". Now someone correct me if I'm wrong. If you replace the header with a Borla header you lose the first cat? When you replace the 2nd one you dont touch the mid pipe. Is your system custom? I don't remember how the MRT header is but you will be better off replacing from the header back. Have it all done in one shot.

gil_ong81
11-04-2005, 02:40 PM
and that's the point, reason. i want to keep what i currently have (MRT headers and midpipe), and replace JUST the gutted cat with a functional one.

Wiscon_Mark
11-04-2005, 08:20 PM
[Diagram]

-----------=========---------------========
[headers]......[cat]..........[midpipe]...[axel back]
.......................^
You only have to replace this part with the stromung. It bolts to the midpipe. All you're replacing IS the cat.

badbasser98
11-04-2005, 08:33 PM
[Diagram]

-----------=========---------------========
[headers]......[cat]..........[midpipe]...[axel back]
.......................^
You only have to replace this part with the stromung. It bolts to the midpipe. All you're replacing IS the cat.


lol, nice diagram...

This is true, the exhaust is actually four parts.

gil_ong81
11-05-2005, 12:30 PM
my mistake. my cat is situated right after the headers. there isn't one in the midpipe.

http://img108.imageshack.us/img108/2630/exhaustcat2ym.jpg

Huffer
11-05-2005, 11:59 PM
Can you do a wider angle pic of that?
It looks like the MRT headers include a cat, or some kind of resonator.
That looks a little small to be a cat...

You also have a flexjoint, which is nice, and unusual to see (for me, at least, on these cars. WRXes etc I'm used to).

Wiscon_Mark
11-06-2005, 12:01 AM
no, that looks like a cat to me...where it says "No Flange" it looks to be welded to the headers. After the Flange is the resonator.

gil_ong81
11-06-2005, 10:25 AM
edited picture.

surprisingly that IS a cat. and it's welded to the headers on the front, and has a flange on the rear, with a flex joint right after.

95LegacySTI
11-27-2005, 12:32 PM
Get a Stromung. It's a little bit of extra money but its worth it. You dont have to replace the center pipe if you get the high flow cat. +1 for Stromung

gil_ong81
11-27-2005, 12:33 PM
interesting. link?

Wiscon_Mark
11-27-2005, 12:36 PM
can't really link directly, but go to boxer4racing.com and go under Legacy Performance---->Exhaust----->cat

gil_ong81
11-27-2005, 12:39 PM
do you mean this bit?

http://www.teaguesauto.com/images/Stromung/highflowna.jpg

doesn't say anywhere that they seel JUST the cat.

Wiscon_Mark
11-27-2005, 12:42 PM
They sell the piping with the cat (as pictured). It bolts directly on to the headers and the Midpipe on all 2nd gens.

gil_ong81
11-27-2005, 12:44 PM
dammit mark!!


it would, except i really don't see much point is getting rid of my existing midpipe for the sake of a cat when i can replace JUST the cat. it's like getting a new brake system all around when all you need is replace the pads.

besides i can think of lots of other things i could do with the additional $300.

Wiscon_Mark
11-27-2005, 12:54 PM
um, we dicussed this already...it doesn't replace your midpipe...you just asked if they sell JUST the cat...and I said, they sell what's in the picture EXACTLY. It bolts up TO the midpipe and TO the headers.

gil_ong81
11-27-2005, 12:55 PM
um, we dicussed this already...it doesn't replace your midpipe...you just asked if they sell JUST the cat...and I said, they sell what's in the picture EXACTLY. It bolts up TO the midpipe and TO the headers.


which is essentially useless of me.

Wiscon_Mark
11-27-2005, 12:58 PM
I really don't understand what you mean...do you mean to say, all your cat piping is 2.25" and you just need the cat itself? I guess since your exhaust is already frankenstein'd (welded in all sorts of crazy places!!) that you'd only really need the cat, but it looks like your piping is 1 7/8ths" and that won't do....

voorhees
11-27-2005, 01:00 PM
well I just bought one(Stromung as pictured) and Borla headers 17183...can't wait to brag to all bout how sweet it is

gil_ong81
11-27-2005, 01:02 PM
.... all your cat piping is 2.25" and you just need the cat itself?

precisely that, my friend.

i have 2.25" headers and a 2.25" mid-pipe (with a gutted cat).

Wiscon_Mark
11-27-2005, 01:03 PM
get the catco then, that's what belladonna has, and she likes it. She passed emissions with it, FYI.

Wiscon_Mark
11-27-2005, 01:04 PM
update that picture, Gil, I want to have another look...

belladonna
11-27-2005, 01:10 PM
i might add that in my part of pa they only look to see that you have a cat. nothing more. :wink:

gil_ong81
11-28-2005, 08:01 PM
Update pic.

as you can see. i don't need a mid-pipe.

Huffer
11-29-2005, 11:57 AM
my mistake. my cat is situated right after the headers. there isn't one in the midpipe.

https://sl-i.net/FORUM/

I have to quote this because your thread is all crazy.

Firstly - don't worry about a cat in the midpipe.

Secondly - you're probably going to have to have some fancy work done to replace the cat and keep that flex section (because of rust).

Third - you will be fine to get any catalytic convertor and then have an O2 bung welded in for the rear sensor.

This is not a big job, any decent muffler/exhaust shop should be able to handle it.

gil_ong81
11-29-2005, 12:14 PM
now you feel my pain??

and the whole thing is SS, so i'm sure it'll just add some excitement to the whole deal.

Huffer
11-29-2005, 02:04 PM
yeah man, I see the confusion/issues.

Wiscon_Mark
11-29-2005, 05:31 PM
I would like to point out that the cat on the stromung is in the same spot as the cat in your picture. the extra piping goes to the headers, but yours is not a stock configuration anyways.

so i guess it wouldn't make any sense to get the stromung for you, because of your frankenstein exhaust ;)

good luck :)