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Removing Catalytic Converter


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#1 scagle777

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Posted 20 February 2008 - 08:19 AM

I have an '03 K1500 with a 5.3. If I remove my cat, will my truck run bad?? I know that they have sensors after the cat and didn't know if this would make my truck run bad
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#2 ATMINF

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Posted 20 February 2008 - 09:09 AM

Your truck has OBD-2 on it and it reads the O2 sensors (should be 4 of them total, 2 before the CATs and two after) to monitor a lot of stuff. If you do not retune the computer to not read the rear O2 senors it will set off a code. So if you want to remove your cats without redoing the PCM your truck will have its warning lights come on. As for running worse propbably not, but I am not sure what the PCM will "tell" the motor to do once the warning light comes on. Also why do you want to remove the CATS, the peformace gain is minimal, if any and its one HUGE Fine in alot of places?
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#3 chitownpete

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Posted 20 February 2008 - 09:21 AM

Your truck may or may not run worse but your lungs and the lungs of those near your truck will definately suffer. If it was 1978 I would say go for it but these days nobody really does that, it doesnt help and often hurts. If nothing else leave it on for the kids, they're getting a crappy planet as it is no need to make it worse. Plese dont get mad just telling the truth.

#4 pm26

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Posted 20 February 2008 - 09:23 AM

In one word:

ILLEGAL

#5 redvett

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Posted 20 February 2008 - 09:34 AM

Modern Cat's flow as good as ever and with sufficient back pressure for the 4.8,5.3 & 6.0L engines to run best for street use. Just not worth the trouble removing.

#6 VMax2007

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Posted 20 February 2008 - 09:43 AM

Also, if you remove the CATS, plan on doing ALL of your own service work, including tires. I was at the tire shop getting my wheels/tires put on and a guy came in with a used car he just bought that needed tie-rods and the shop refused to work on it because the CAT was missing. He went on to explain that it is ILLEGAL for any shop to work on a car with it's CATS missing unless they replace it as part of the service. They face HUGE fines for working on a car without CAT, regardless of the type of work performed. The Gov't is really cracking down on this, as they should.

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#7 stss95

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Posted 20 February 2008 - 10:27 AM

Just buy a pair of 02 sims and you won't get any service lights.

#8 DV2000NJ

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Posted 20 February 2008 - 10:30 AM

Your truck may or may not run worse but your lungs and the lungs of those near your truck will definately suffer. If it was 1978 I would say go for it but these days nobody really does that, it doesnt help and often hurts. If nothing else leave it on for the kids, they're getting a crappy planet as it is no need to make it worse. Plese dont get mad just telling the truth.



Couldn't have said it better myself. :banghead: A vehicle with a cat produces 90% less emissions than the same vehicle without a cat. There's a reason it's there.

Edited by DV2000NJ, 20 February 2008 - 10:32 AM.

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#9 saskfarmer

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Posted 20 February 2008 - 10:37 AM

Your truck may or may not run worse but your lungs and the lungs of those near your truck will definately suffer. If it was 1978 I would say go for it but these days nobody really does that, it doesnt help and often hurts. If nothing else leave it on for the kids, they're getting a crappy planet as it is no need to make it worse. Plese dont get mad just telling the truth.


It is reccommended to change your catalytic converter every ten years. The reason for this being that with use, they break down and actually end up doing more harm then if they were not there at all.

If you cut it off on newer vehicles, there is a good chance it will run like s%^t due to the 02 sensors


#10 cambo

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Posted 20 February 2008 - 10:38 AM

Don't do it.


Plain and simple.

Edited by cambo, 20 February 2008 - 10:39 AM.

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#11 Silverado4x4

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Posted 20 February 2008 - 10:45 AM

Leave it on, as said the motor and power improvements will be minimal and if any maybe worse to due loss of some back pressure. Converters back in the mid to late 70s when removed did make a differance but not now there all free-flow. Just not worth the trouble.

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#12 redvett

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Posted 20 February 2008 - 10:58 AM

2009 C6 Corvette has converters and makes 620+ HP if the MFR's can make that kinda HP and be emission compliant there is no reason to remove the Cat's.

#13 scagle777

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Posted 20 February 2008 - 12:17 PM

I probably won't do it anyway. But we don't have emissions where I live and I was really more curious than anything because I thought that removing the cats would make the truck run bad and have an erratic idle. But I just like 'em loud!!!! :rolleyes:
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#14 Silverado-CoA

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Posted 03 March 2008 - 09:58 PM

aye leave em on

side not, it is not illegal everywhere to remove cats. there is no federal law saying that, it goes state by state, even then only certain counties

#15 unit731

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Posted 03 March 2008 - 10:06 PM

I probably won't do it anyway. But we don't have emissions where I live and I was really more curious than anything because I thought that removing the cats would make the truck run bad and have an erratic idle. But I just like 'em loud!!!! :lol:



It is illegal. No matter what your state has for laws. These are federal laws. Assuming you are USA. But beyond that.

You also have resale value to think about. I suppose you could put it back on when done.

But there is just too much hassle if taken off. Can it be done. Sure. Is it wise. No.
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