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Old 02-15-2011, 06:23 PM
Alon Alon is offline
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Default Re: Removing a cat. Any harm in doing it?

Originally Posted by tcmills3 View Post
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
You can not legally do anything to a cat on any vehicle that came with them unless you are replacing it with another factory cat.

Where did you get the 1992 year?
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Old 02-17-2011, 12:24 PM
bluerang3r bluerang3r is offline
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Default Re: Removing a cat. Any harm in doing it?

Originally Posted by joker515 View Post
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
haha wow whoever told you that is a re-tard. if that was the case I dont think nascar would use straight pipes.. but in my experience as long as you have a one cat and a O2 sensor before and after the cat you should be fine. I have high flow cats on my truck and i dont throw codes or anything and still pass the 49 state emission test( california is the only state that i dont pass in but i am excempt since I am military) and if you do gut the one cat before the downstream O2 sensor it will throw a code telling you that this "O2 sensor High Voltage" and spit out a number for the O2 sensor bank 1 or 2. and that will make the computer to adjust the fuel for the rich fuel mixture and the computer will adjsut the injectors to back off the fuel until it can't adjust anymore and then it will set off the CEL
2009 ford ranger Sport 4.0L V6/2 8" red hot glasspacks swept side before rear tire/2 catco high flow cats/K&N 77 series intake system/BFG all terrain 31x10.5x15 tires/Procomp 98 series rock crawler black rims/westin black sportsman brush guard/6-6'' Hella 500FF lights/black rhinoliner/Bilstein 5100 shocks/uniden 68LTW CB radio/Fx4 skid plates/cranked Tbars/autometer vaccum, Camper shell with thule roof rack/ belltech shackles/Pioneer headunit with pioneer speakers with Kicker 10'' sub
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Old 07-06-2011, 12:28 AM
fork80 fork80 is offline
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Default Re: Removing a cat. Any harm in doing it?

Ok. So as I was LMAO at reading some of the replies going through this thread again, I realized what I did to pass smog in California with my '86 (Don't get me started on the outrageous emissions standards in CA). It's hydrocarbons where through the roof at truck, not California. I got word through the grapevine about a quick fix if you're in a bind.

step one: Find a chemical supply company that sells to the public.
two: Purchase a gallon of anhydrous alcohol. (alcohol at least 99.7% pure)
three: Add enough to the fuel tank to make the mix about 15-20% alcohol. Try to do this with under 1/3 tank of gas. 1/4 would be ideal.
four: Take said vehicle to smog station and pass with flying colors.
five: Get to a gas station and fill up the rest of the tank with gas (petrol for you Englanders) to thin out the alcohol. It tends to run hot.

I had to do it twice in that vehicles life. Worked like a charm. Ended up with hydrocarbons in the single digits....down from over 1100.
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Old 07-07-2011, 06:09 PM
JLAUDIOranger JLAUDIOranger is offline
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Default Re: Removing a cat. Any harm in doing it?

if you want the real deal on this subject, all it's gonna do you is harm, air-fuel mix'll probably be out of wack, you won't pass emissions nor motor vehicle inspection, add to that you'll loose power for the following reason,

engineers who designed your truck engine are smart, (so they say anyways) the back pressure thing everyone's worried about is actually a bigger deal then one would think, ever heard valve overlap inside an engine? backpressure has a lot to do with it, basically when the intake and exaust valves are open at the same time for maybe 15-30 degres, the backpressure keeps flowing out of your exaust system when the intake stroke is beginning, that actually sucks in air in the cylinder giving you a fresher and denser charge of air in your cylinders, loose back pressure, less eficient engine, so to run it straight pipe, you need a set of cams, heads valves and the list goes bet is to just stick with whatever you have or bring out the wallet and build your engine from the ground up of you want straight pipes, best of luck to you buddy
the little winter beater ...I still gotta figure out why I drive this darn 2wd thing when I drive an all wheel drive truck in the summer seriously what the F**K is up with that?!
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Old 07-07-2011, 06:21 PM
matt224 matt224 is offline
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Default Re: Removing a cat. Any harm in doing it?

I disagree JL.

Removing cats has never showed a decrease in performance in any applications I have seen (if anything it can improve performance if you followup correctly, though I will say high flow cats flow just as well as straight pipes). I also disagree on the "backpressure" theory. I believe you are talking about exhaust scavenging in which exhaust gases cool whilst travelling through the exhaust system; the cooling gas contracts in the pipe creating a vacuum to help scavenge exhaust gases from the cylinders. This is why running open headers often lacks low end power, not because of backpressure, which is a myth. I WILL say that a tune will be needed after removing cats or doing any other major exhaust work to correct that a/f mixture.

Regardless, I would recommend you not removing your cats as it keeps unneeded pollutants out of the air.
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Old 07-07-2011, 11:48 PM
huskerman16 huskerman16 is offline
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Default Re: Removing a cat. Any harm in doing it?

cut your cats and get o2 simulators
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Old 07-09-2011, 10:12 PM
Whatthetruck Whatthetruck is offline
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Default Re: Removing a cat. Any harm in doing it?

Just a it kaptnick or catnip ?
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