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Old 07-25-2002, 04:12 AM   #1
cyborg7_
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Member#: 16571
Join Date: Mar 2002
Location: Saint Charles, IL
Vehicle:
2000 Impreza 2.5 RS
'90 Honda Civic si hatch

Default Do I really need my cats for anything?

I am relatively new to this whole car bit so bear with me. I realize that the less restrictive an exahst system is, the easier it is for your engine to function, and hence you obtain more power. From what I understand the catalitic converters are one of the biggest killers of HP (I have heard 7-15hp). My question is whether or not I could simply remove the cats on my '00 RS and go from my stock headers to my current cat-back exhaust with just a straight pipe?

I live in illinois, and we to have emmisions testing, but luckily my AWD exempts me from taking the test. Does anyone know if this is at all feasable???
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Old 07-25-2002, 04:49 AM   #2
Kostamojen
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Yes, its feasible, but you will be polluting like a mofo... I dont know if the couple of HP are worth it since you can just get at least a high-flow cat and stop some of the bad stuff...
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Old 07-25-2002, 07:04 AM   #3
Peaty
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Old 07-25-2002, 07:06 AM   #4
RawCode
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Yeah and your car will stink like a mofo too. You know how a car normally smells when they floor it? Well it is 10 times worse than that.

RawCode
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Old 07-25-2002, 08:15 AM   #5
danci1973
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Quote:
Originally posted by RawCode
Yeah and your car will stink like a mofo too. You know how a car normally smells when they floor it? Well it is 10 times worse than that.

RawCode
I have to disagree here... I still have one cat-less car in my yard and it doesn't smell any worse than any of the other cars (2x Legacy, 1x Vivio), all equipped with cats.

In fact, the cat's produced a very nasty trash-yard smell when they were new. I guess they are fine now - worn out.

D.
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Old 07-25-2002, 01:09 PM   #6
Julian
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Can you run without cats? Sure. Will you gain 7-15HP? No way. Will your car run like crap and you'll have permanent CE lights and have warranty troubles down the road? You bet.

Just because your car is AWD doesn't necessarily make it exempt from emissions. Every state is different, but here in Cali AWD cars still have to be smogged, they just don't have to run on the two-wheel-drive dyno.
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Old 07-25-2002, 02:05 PM   #7
fourwheeldrift
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Default emissions

ohio and indiana run AWD cars on a 4 wheel dyno.

catalytic converters perform an important function and are there for a reason.... to keep the air we breathe clean. If you don't think it matters go visit some place like Bangkok and you will appreciate the emmisions standards in the US.

If you are going to only race your car that's one thing but if it's an every day driver...
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Old 07-25-2002, 04:16 PM   #8
cyborg7_
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'90 Honda Civic si hatch

Default

You guys are all probably right about just getting a high-flow cat. I looked into it and the prices arent that bad, so it probably is a good idea. Thanks for all the input. By the way- does anyone know what kind of power gains I could get from a high flow cat w/ catback??? (I am just a bit to broke to do headers right now!)


also, I couldn't help but notice how concerned you guys in Cali are about polution! Here in chicago it feels like breathing porkchops, so your not alone out there!
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Old 07-25-2002, 04:22 PM   #9
Section 8
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Acording to ChickenCow....

You need them so there is a reason for the box of $hit in your house.

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Old 07-25-2002, 07:16 PM   #10
obyone
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Default Re: Do I really need my cats for anything?

Quote:
Originally posted by cyborg7_
I live in illinois, and we to have emmisions testing, but luckily my AWD exempts me from taking the test. Does anyone know if this is at all feasable???
Whoa there ...AWD cars are not exempt from emissions testing in Illinois. Who told you that?

Before I bought my scoob, I asked one of the emissions testers that I was planning on buying a AWD car and asked how they would be tested. The guy told me, "No problem. You just turn off the 4WD, put it into 2WD and run it like normal." After I told him he was a moron, I asked another tech there. He told me that they test the car but they do it at idle, or they would leave it in neutral and rev the engine.

So Subaru's are tested, but they are not tested under load like everyone else out there.



......Get a high flow cat. I don't want to be breathing your exhaust fumes if I don't have to.
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Old 07-25-2002, 10:39 PM   #11
nixx
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The max you're gaining from removing the stock cat is 5HP. If you get a highflow cat you're almost losing nothing at all. So please do us a favour and have a cat on your car. This goes for everyone too. The air is getting bad as it is.
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