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  #16  
Old 01-20-2011, 09:57 PM
rynoaasheim rynoaasheim is offline
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Default Re: Removing a cat. Any harm in doing it?

Damn Cats!!!!! LMAO
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  #17  
Old 01-21-2011, 12:17 AM
fork80 fork80 is offline
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Default Re: Removing a cat. Any harm in doing it?

Depends on if it's de-clawed or not.
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  #18  
Old 01-21-2011, 12:14 PM
stringburner stringburner is offline
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Default Re: Removing a cat. Any harm in doing it?

I've read of some vehicles that will throw a code (check engine light will be on) if you remove the catalytic converter because it alters the reading on the downstream (after the catalytic converter) oxygen sensor. Not sure if that phenomenon will happen on a Ranger or not.
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  #19  
Old 02-03-2011, 05:16 PM
Botta Ranger Botta Ranger is offline
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Default Re: Removing a cat. Any harm in doing it?

Kill the polar bears. Who needs 'em.
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  #20  
Old 02-03-2011, 05:22 PM
ben10 ben10 is offline
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Default Re: Removing a cat. Any harm in doing it?

im interested too, i wouldnt mind gutting my down stream cat. sound would be nice!
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  #21  
Old 02-03-2011, 11:50 PM
joker515 joker515 is offline
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Default Re: Removing a cat. Any harm in doing it?

according to a couple people (of questionable intelligence) removing your cats can cause anything from a skewed fuel/air ratio to (im not making this up, i was actually told this by someone older and supposedly wiser than I) creating a loss in backpressure powerful enough to suck a valve through the block and spit it out your tailpipe
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  #22  
Old 02-04-2011, 01:21 AM
2002 2WD Edge 2002 2WD Edge is offline
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Default Re: Removing a cat. Any harm in doing it?

Quote:
Originally Posted by kaptnick View Post
So I'm pretty sure there are four cats on my truck and one of them looks like its after the O2 sensor. is there any harm in removing this (and obviously replacing it with pipe) ? Would the truck still pass emissions and such and how would it affect the sound?

Also its a 4.0 sohc
Thanks
The pipe through the cats are straight through/unobstructed, the cats very expensive...4 of them very much so. Why remove them? But check with a local dealer as to how removing them would affect you where you live. You can gain performance before and after the cats, while leaving them there for the sake of emission testing.
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  #23  
Old 02-05-2011, 01:45 PM
vinny18 vinny18 is offline
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Default Re: Removing a cat. Any harm in doing it?

Cat [KAT]
–noun
1. a small domesticated carnivore, Felis domestica or F. catus, bred in a number of varieties.
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  #24  
Old 02-05-2011, 01:50 PM
dirttrackracer dirttrackracer is offline
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Default Re: Removing a cat. Any harm in doing it?

you wont blow a valve out the exhaust removing one cat
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  #25  
Old 02-05-2011, 11:00 PM
01B3000 01B3000 is offline
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Default Re: Removing a cat. Any harm in doing it?

Damn did this thread get hijacked quickly...
Quote:
Originally Posted by stringburner View Post
I've read of some vehicles that will throw a code (check engine light will be on)
Yes the computer will through a code up causing the CEL to show. The downstream sensor will detect that the cat is gone by noticing the lack of oxygen that the last cat would actually produce off the exhaust gasses. There are ways to get around it, i think ive seen O2 sensor spacers which lets less gasses get to the sensor making it think its working correctly.
But also, all vehicles OBD2 will do that if it detects an error in any of the O2 sensors, damn epa.
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  #26  
Old 02-05-2011, 11:20 PM
kmk7110 kmk7110 is offline
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Default Re: Removing a cat. Any harm in doing it?

I've also heard that it is against federal law to do so on a vehicle that comes with them. That its a fine of somewhere in the ball park of 1500 dollars. I guess the reasoning is pollutants and all that jazz.

One of my friends was looking to do that to his impala but backed out after reading that. Just what he told me the last time i asked. I haven't actually read it anyplace tho.
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  #27  
Old 02-06-2011, 08:26 PM
Crawl Crawl is offline
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Default Re: Removing a cat. Any harm in doing it?

The last 2 cats on a friends ranger exhaust r gutted , passed inspection no problem, no codes etc. runs like a champ. Has a 99, 4.0L
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  #28  
Old 02-15-2011, 06:41 PM
JLAUDIOranger JLAUDIOranger is offline
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Default Re: Removing a cat. Any harm in doing it?

don't want to break your bubble, but removing the catalytic converters is pretty much illegal anywhere you are, best bet is to hollow it out and weld a pipe straight through it, then again depending where you are, won't pass emissions or MVI, add to that it'll probably turn on the CEL in your dash since the O2 sensors will probably notice the change of exaust, probably will fuck up your air/fuel mixture and other stuff, best not to mess around with it
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  #29  
Old 02-15-2011, 07:05 PM
Alon Alon is offline
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Default Re: Removing a cat. Any harm in doing it?

Quote:
Originally Posted by JLAUDIOranger View Post
don't want to break your bubble, but removing the catalytic converters is pretty much illegal anywhere you are, best bet is to hollow it out and weld a pipe straight through it, then again depending where you are, won't pass emissions or MVI, add to that it'll probably turn on the CEL in your dash since the O2 sensors will probably notice the change of exaust, probably will fuck up your air/fuel mixture and other stuff, best not to mess around with it
Removing the cat is illegal, hollowing it out and welding a pipe straight through is just as bad.

I took the last one off on my 4.0 because i thought it was bad. I got zero performance gain and zero sound difference. I also passed CA smog tests without it.
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  #30  
Old 02-15-2011, 07:22 PM
tcmills3 tcmills3 is offline
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Default Re: Removing a cat. Any harm in doing it?

Removing the cat will just make it louder, no gains or losses. If your vehicle is 92 and older you can cut them. 93 and newer typically to pass emissions you need them
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