Cut off the Cat
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New User
Joined: Apr 2006
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Cut off the Cat
Seen a few posts lately about Cats.
And I got Curious.
My 1992 F150 5.0 4x4 was neutered by a local muffler shop.
The cat was trash, and they gave me the option of replacing it, or running with out it.
I opted for no cat.
I am 100% positive that they made no further adjustments, they simply got rid of the cat.
Should I be doing something to compensate for not having a cat?
TIA
And I got Curious.
My 1992 F150 5.0 4x4 was neutered by a local muffler shop.
The cat was trash, and they gave me the option of replacing it, or running with out it.
I opted for no cat.
I am 100% positive that they made no further adjustments, they simply got rid of the cat.
Should I be doing something to compensate for not having a cat?
TIA
Freshman User
Joined: Jun 2006
Posts: 28
Likes: 0
From: Ennis, Texas
bad move emission just went out of sight lucky your not in emission county, i think it is against the law for them to remove the cat, you probley hurt your gas milage as the o2s will not work proper
Tuned
Joined: Jun 2006
Posts: 420
Likes: 3
Originally Posted by ksdunlap
i think i read somewhere that it needs the backpressure for the o2 to work properly and also to maintain heat on o2
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
As long as your truck is 95 or older ie pre 96 then it is fine. If you have California emissions this might be different. Basically if there is only one O2 before the cats then it is fine. If there is an O2 after the cats, it won't work properly without them. EEC-IV or OBD-I is ok but OBD-II will not like this. There are a lot of 5.0 Mustang, Camero, Firebird, etc guys that remove them for street/strip or just strip use. Most likely your truck will run better with out the cat(s).
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Thanks for all of your input.
The truck runs great, and since the operation has a very cool growl.
The truck runs great, and since the operation has a very cool growl.
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Joined: May 2006
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From: sault ste marie ontario
had a 88 f-250 5.0 . took the cat off and what a differance. like a new truck.imsure its illegal but owe well,you cant please everyboby.im sure if your in a place where they have checks on emissions youd be made to replace sooner or later.about a month ago i put old bettsy out to pasture doing what she does best and that is hauling wood and plowing snow. it was or should i say it is a tuff old beast.
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Post Fiend
Joined: Oct 2003
Posts: 6,214
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From: New Jersey
Removing the cat may or may not be illegal in your state/county, however it is against FEDERAL law in the USA. You don't want to know the fine, or the imprisonment term either, not that it's enforced on a federal level at all. But the consequences are steep and on the books.
Personally, I'd replace the cat, only because if everyone removed it our landscape would smell like NYC or LA. It doesn't hurt anything to have it, except your wallet every 8-10 years.
Not having a cat doesn't effect your EFI system at all, because the O2 sensor is before the cat anyway (in your case, some of the newer trucks have two 02 sensors, one before, one after the cat, and in that case you must have it for it to work properly and not spit codes).
Personally, I'd replace the cat, only because if everyone removed it our landscape would smell like NYC or LA. It doesn't hurt anything to have it, except your wallet every 8-10 years.
Not having a cat doesn't effect your EFI system at all, because the O2 sensor is before the cat anyway (in your case, some of the newer trucks have two 02 sensors, one before, one after the cat, and in that case you must have it for it to work properly and not spit codes).
Freshman User
Joined: May 2006
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From: sault ste marie ontario
how true if i had of been keeping my truck i would of bought a new cat. if my f250 had of had a 300 six in it i dont think it would of even come with a cat but i could be mistaken.also performance cats are sold now.
Last edited by cougar1985; Jun 9, 2006 at 09:31 AM.
Senior User
Joined: Jan 2006
Posts: 303
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From: Bertha Minnesota
Everybody grab a hacksaw, a couple beers, and cut off those cat's. Then put on a straight pipe and maybe a glass pack and let'er beller. V8's were made to roar. But don't mind me i'm a redneck!!
