Would it cause problems to eliminate the catalytic converter - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-19-2008, 12:36 AM   #1
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Default Would it cause problems to eliminate the catalytic converter

If i took off the cat and just replaced it with a piece of exhaust pipe, would it cause any engine problems. I know it wouldn't be emissions legal but my state doesn't do emissions tests. I also realize there may be some environmentalists who might flame me for asking this but i was just wondering.
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Old 02-19-2008, 12:40 AM   #2
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Loss of low end power, increased pollution, illegal in all 50 states, etc.
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Old 02-19-2008, 12:51 AM   #3
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Quote:
Originally Posted by Bonneville92V688
Loss of low end power, increased pollution, illegal in all 50 states, etc.
Yeah, I understand it would be illegal and I'm not going to do it. But since I was having problems with the car missing and if replacing the plugs, wires and coil packs didn't fix it, I thought maybe my cat could be bad and figured i would try to take it off to see if it ran right. then if so I would get a new cat. But if taking the cat off would create other problems then i wouldn't be able to "test" anything by taking it off. I should have explained that in my first post.
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Old 02-19-2008, 12:58 AM   #4
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Yeah man, just remember that I could get around 250 bucks for reporting a cat-less car.. It'* not worth it at all. The hp gains aren't worth the lack of low end. If you ran a turbo or had a high-rpm torque curve, a straight-pipe might be a consideration.. But you lose critical back pressure which loses you a ton of down-low power. Just my two cents... If you want to mod your exhaust starting with your cat, get a high-flow...

http://www.performancepeddler.com/de...CT_ID=MAG94806
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Old 02-19-2008, 01:04 AM   #5
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going against what is in this thread, I ran my 00 with no cat for almost six months after I had my headers installed. I just had my magnaflow hi-flow cat installed and noticed absolutely no performance difference.
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Old 02-19-2008, 01:10 AM   #6
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I appreciate the help. I'm not really looking for performance gains. I just want to use my car as a good dependable daily driver. I made another thread explaining what it is doing and the way it misses. I'm just trying to find ways to solve that problem. I don't have a lot of money and buying high performance cats aren't in my budget. I just figured if the new plugs, wires and coils didn't stop it from missing them maybe the cat was plugged and i'd take it off until i could get a new one installed. But I didn't know if the computer would act different when it noticed the cat was missing or anything like that.
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Old 02-19-2008, 01:30 AM   #7
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to answer your question, no, it wouldnt hurt anything or cause any other problems. just dont plan on running it for very long without it, as it is illegal.

p.*. iirc hi flow cats are cheaper than a regular cat
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Old 02-19-2008, 01:37 AM   #8
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Thanks for the advice guys. I appreciate it. I'm not planning on leaving the cat off for very long if I even do it in the first place. I did just check some prices of cats and they aren't as bad as I assumed. I thought they'd be a few hundered bucks but found several for around a hundred. That'* not bad.
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Old 02-19-2008, 01:46 AM   #9
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you should be able to find one on ebay for $50, and the installation should be about the same...
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Old 02-19-2008, 02:00 AM   #10
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Quote:
Originally Posted by harofreak00
you should be able to find one on ebay for $50, and the installation should be about the same...
Cool, thanks.
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