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Old 09-12-2005, 01:40 PM   #1
LegacySTI
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Default Does anybody with a BD run without a cat?

I was wondering if any BD guys ran without the cat. and if so, do you have any problems with it?
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Old 09-12-2005, 02:07 PM   #2
Perdue
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I ran mine catless for a while. I used the O2 Sensor Spacer from Rallitek and didn't have any problems, CELs, or anything else. It was extremely loud though and I will not do it again.
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Old 09-12-2005, 02:24 PM   #3
KD7000
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Why do you want to run catless?

A good high-flow converter will make about as much power as a "race pipe" but still keep the environment happy.

It'll also keep your car legal- do they test emmissions in your state?
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Old 09-12-2005, 02:31 PM   #4
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They do tests in WA, but they just plug in a reader to the OBD port. You can make mods so the computer reads the cat is functioning properly.

From the folks I talked to, even with out the cat, a new subie, might be able to pass a sniff test, but I'm not positive.

I won't run catless because of my conscience. I'm getting a hi-flow turboxs cat for my car.
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Old 09-12-2005, 03:14 PM   #5
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I've been running a gutted cat since i got it in Oct 03. CEL came on a few months later, sometime in the spring.

I replaced the rear O2 sensor cos it looked pretty beatup on visual inspection, and the CEl has been much better behaved. Now, it only comes on when I go from crusing at alittle over 3,000rpm to a little under 3,000. I'm thinking the next thing i might need to do is to replace the front O2 sensor.

Been looking for a hi-flow cat, but haven't been able to find a decent one that i'm able to comfortably afford.
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Old 09-12-2005, 04:36 PM   #6
LegacySTI
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The reason I ask is because I have a stromung track pipe and my car is running really rough, the dealership says its because I have no cats and the O2 sensor are overloading the system
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Old 09-12-2005, 07:08 PM   #7
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Quote:
Originally Posted by LegacySTI
The reason I ask is because I have a stromung track pipe and my car is running really rough, the dealership says its because I have no cats and the O2 sensor are overloading the system
sounds like you need something to "fool" your o2 sensor so you stop running rough. You could pick up something like this for cheap.
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Old 09-12-2005, 10:18 PM   #8
Gil
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and just what might this "thing" be??
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Old 09-12-2005, 10:32 PM   #9
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Quote:
Originally Posted by Perdue
. I used the O2 Sensor Spacer from Rallitek...

I believe you can also get it from boxer4racing...I got one, because my hi-flow cat just arrived today!
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Old 09-13-2005, 05:53 AM   #10
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IIRC, Boxer 4 uses electronic bosses to control the o2 sensor, but from what I've heard, these will sometimes still give a CEL with a fully catless system. I'd say get the spacer from Rallitek (Boxer4 might sell'em...too lazy to look). It worked well for me, but what works well for one ECU might piss off the other ECU.
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Old 09-13-2005, 07:00 AM   #11
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+1 for the spacer... It's what I use and I've never tripped a CAT inefficiency code..
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Old 09-13-2005, 08:14 AM   #12
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I'll give it a shot.
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Old 09-13-2005, 08:17 AM   #13
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Quote:
Originally Posted by Perdue
(Boxer4 might sell'em...too lazy to look)
I dunno if they have it listed on their webpage, but they threw one in for me when i purchased my stromung Hi flow cat from them
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Old 09-13-2005, 08:20 AM   #14
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According to boxer4, they have an electronic boss, however will have another option (non-electronic) for the BD's soon. As of last week it was still not on theier website. Give them a call.

Peace,
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Old 09-13-2005, 12:07 PM   #15
Gil
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what's an electric boss?? in fact, what's a boss?
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Old 09-13-2005, 12:14 PM   #16
Russell Rogers
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go back to ahving cats. NA Subaru's make more power with cats unless the ecu is heavily tuned.
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Old 09-13-2005, 01:03 PM   #17
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Quote:
Originally Posted by Russell Rogers
go back to ahving cats. NA Subaru's make more power with cats unless the ecu is heavily tuned.
More power, or more torque?

I've never seen a dyno plot with a higher HP reading of cat vs. no cat.
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Old 09-13-2005, 01:59 PM   #18
Russell Rogers
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Both. NA subarus do not scavenge exhaust well without cats. Let alone the fact that running no cats in washington state is risky.
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Old 09-13-2005, 03:39 PM   #19
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Surely scavenging is a byproduct of the exhaust design, not dependent on the inclusion of a catalytic convertor?

(ignoring EPA requirements for the sake of argument)
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Old 09-13-2005, 04:36 PM   #20
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my car seemed to have more power in the upper rpms actually, this being with EJ22, Borla Headers, Catless with just a canister style muffler. This ended up being way too loud, as I stated above, and really raspy, causing the exhaust to frankly sound like crap. I dunno how much it would differ with the Borla Turbo muffler I'm running now, but I'd rather not find out.
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Old 09-13-2005, 04:38 PM   #21
Russell Rogers
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exhaust backpressure has a huge role in scavenging.
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Old 09-13-2005, 06:44 PM   #22
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Here's a description of the O2 sensor boss from boxer4:
http://www.teaguesauto.com/exhaust.htm
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Old 09-13-2005, 07:08 PM   #23
Gil
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you mean the resistor mod?
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Old 09-13-2005, 10:24 PM   #24
Huffer
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Quote:
Originally Posted by Russell Rogers
exhaust backpressure has a huge role in scavenging.
That's correct, but that doesn't mean you have to run catalytic convertors to achieve the same effect.
Pipe diameter, addition/subtraction of bends, resonators etc all contribute to the famed "backpressure" phenomenon.

Do you have any proof that a catless system is less powerful vs. a catted system (ceteris paribus - all things being equal)?
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Old 09-14-2005, 11:28 AM   #25
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Iím not sure why you would want to do this to a daily driver. The cat cuts down carbon monoxide, NOX and, most importantly toxic hydrocarbons. There is some nasty, volatile stuff that comes out of engines- most notably benzene, olefins, formaldehyde, all of which have neurotoxic, carcinogenic, reproductive and developmental toxicity effects. The cat reduces or eliminates a substantial amount of these hydrocarbons, without it you, your kids or whoever are breathing in a daily dose every time you back out of the driveway or pull out of your garage. Not worth it IMHO.
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