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Old 01-14-2001, 01:21 PM   #1
Scooby Newbie
Member#: 3506
Join Date: Jan 2001
Have a Nice Day? WRX has too many cat. converters!


I see 3(!) damn catalytic converters!
That's nuts! You know how much HP that is removing off the engine! The first thing that should be done by new owners is to remove those damn things! (only if you are
racing, of course. Wink Wink.
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Old 01-14-2001, 01:28 PM   #2
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Member#: 3506
Join Date: Jan 2001

The good news is the IC looks really thick from that angle. Good job Subaru!
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Old 01-14-2001, 01:35 PM   #3
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Member#: 733
Join Date: Jan 2000
Chapter/Region: MWSOC
Location: Squadra Delle Pecore Nere
'16 Fiesta ST
Platinum white metallic


You complain on how the WRX has too many cats...thank GOD Subaru brought it here for us to drool over. They could have just said (like they did in the past) "oh it's too expensive to bring the WRX to NA because of all the emissions/dot regulations"

Be thankful not whiney about the new WRX...

sorry for venting...

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Old 01-14-2001, 01:47 PM   #4
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Member#: 3506
Join Date: Jan 2001

Sorry you took it the wrong way! I'm insanely happy the WRX is here and it gets 227 hp with three (3!) friggen cats choking it, thanks to the U.S. Govt.!!!

What makes me even more happy is the fact that by removing them, the car will probably gain 30hp!!!

I'm not bitching, I'm pointing out a tuning oppertunity!!

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Old 01-14-2001, 01:54 PM   #5
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Member#: 727
Join Date: Jan 2000
Location: Park City, Utah, USA

O.K. senior members, how many horsepower can we expect through removal (for racing purposes only) of the cats? Can they be removed? What about the tumble valve? Can you remove any of them and still expect to pass emissions?
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Old 01-14-2001, 02:02 PM   #6
Jeff 2.5RS
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Member#: 1590
Join Date: Jun 2000
Location: Olathe, KS
2004 Rx8


Modern Catalytic converters aren't as restrictive as you might think anymore, while removing them will provide some extra horsepower (and maybe removing the one before the turbo make it spool up faster) it's not going to be anything groundbreaking. Plus you're going to have to find a way to get around the ECU if planning on moving those cats.

[This message has been edited by Jeff 2.5RS (edited January 15, 2001).]
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Old 01-14-2001, 03:03 PM   #7
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Member#: 3389
Join Date: Dec 2000
Location: ContraCosta, Ca
07 STImpreza


The ECU will not be as hard as some think. Coming from the honda world I have faced this problem when OBD2 first came out. The ECus can be reprogrammed to ignour one lambada, both, or recode the ECU to behave when a cat is gone and the reading changes.
Or you could just get an apexi Power FC or Link, when it is available here.
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Old 01-14-2001, 03:03 PM   #8
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Member#: 1905
Join Date: Jul 2000
Location: Howell, MI USA

I know you jest, but we Americans must really learn to be more protective of our environment.

Not to sound like some fanatical environmentalists, but it only makes sense, because this earth isn't as big as most people think anymore. We take it for granted, because we have it so good.

There are countries and cities that don't regard good breathing too much and it shows. If you had to breath in a city like Mexico city for a day, you'd demand converters on lawn mowers!

Tune on!
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Old 01-14-2001, 03:04 PM   #9
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Chapter/Region: NESIC
Location: RI/SE Mass
17 OK Sport
00 S2000


OK...looking at the cats...do all three have o2 sensors? If not, you can eliminate some.

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Old 01-14-2001, 03:09 PM   #10
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Member#: 233
Join Date: Sep 1999
Chapter/Region: SWIC
Location: Cupertino, CA

didn't someone say that the ECU will run FUNNY (not just "check engine" light funny) without the cats?
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Old 01-14-2001, 06:33 PM   #11
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Location: San Juan, Puerto Rico
2005 Legacy GT 5MT
Satin White Pearl


Not to sound like some fanatical environmentalists, but it only makes
sense, because this earth isn't as big as most people think anymore. We take it for granted, because we have it so good.
I really do agree with you..but...would a WRX with no cats have worse emissions than most SUVs out there?! which are excempt from EPA regulations? Or at least theyre not as stringent?
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Old 01-14-2001, 06:46 PM   #12
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Join Date: Mar 2000
Location: Ventura, CA


I'm not a SUV lover by any means, but with that said, I must point out that SUVs are indeed regulated for emissions just like us. Ford will even have their models meet LEV status (as applies in Cali). Emissions are different from mileage of course. For the most part cars these days are clean (or, 98% clean compared to unregulated cars). The UK didn't even luck out as much as we have. I'll take a three-cat WRX over nothing every time...

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Old 01-14-2001, 06:52 PM   #13
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Member#: 1305
Join Date: Apr 2000
Chapter/Region: AKIC
2000 Impreza


Jeff 2.5RS is right. Modern catalytic converters are generally no more restrictive than the stock exhaust. The only way you will get gains is by removing the cats and upgrading the rest of the exhaust system as well. Of course if you are removing the cats you would have probably already upgraded the exhaust. Oh, and if you are considering this, look into high flow cats. They are less restrictive, and help the environment as well.
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Old 01-14-2001, 07:24 PM   #14
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Member#: 524
Join Date: Nov 1999
Location: WA
04 STi


While I plan of getting rid of the pre-cat in the crossover if(when?) I get a WRX, I will at a minimum leave one 3 way cat in the system. Cats are cheap, serve as a muffler, and saves you that several thousand dollar fine you get if you are cought running without a Cat.

On review of the pic, my FIRST mods would be to toss the stock crossover, POS turbo, down pipe, and exaust. A used VF-28 is cheap, and I like the IHI relaiblity. The Downpipe would end near the same place, then a bolt in cat section with a 3 way cat, then the rest of the exaust. The crossover would simply have the cat, and turbo flange changed to a straight pipe and flange for the IHI. The bolt in cat section is incase it ever sees racing duty where continious high RPM operation can burn it out.
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