cut it off or keep it ??

[A91EBexplorer4x4]

i hvae a 91 EB 4x4 and im going to run duals out the back and i was thinking of taking the Cat. off . im in a state with no ristrictions , so i dont have to pass an emisions test or anything. i then want to put the flow master and new pipe i was looking at either 40 or 30 series muffler single in dual out. im wondering will taking the cat off effect the engine and the computer sending info? should i not do this? it was just an idea, and if anyone has any knowledge on the 30's series it would be great! Thanks again.

 

[Ray Lobato]

Well, let's see hear. What if I decided to take my cat off also, and what if everyone else wanted to take their cat off. What would happen to the air that we breath?
You know, the cat is there for a reason, and as much as we don't like it. It is ecential to keep, and it is against Fedral law to not have one. You have a 91, so you stand a real good chance that there wouldn't be too many places that wouldn't go ahead and replace you old cat with a brand new Hi-flow cat. There is enough polution in the air. Please don't add to it, just so that you can have dual exhust. Please do it right. I know this isn't the answer you want, but there is a right way and a wrong way to do things. Taking the cat off is the wrong way to do this.

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Happy Wheelin'
Ray L.
97 XLT 4X4 4.0L SOHC

 

[JAY]

Ray has a good point, and to add to this, removing the cat will actually hurt you performance. The 4.0 will benifit from removing some of the exaust restrictions but it still needs a good amount of back pressure to perform. I have ran with out the cat and totally lost my bottom end. The upper end didn't benifit either.
Just something to think about.

JAY

 

[rockylaurence]

The CAT isn't really a ristriction for a stock or slightly modified engine. Notice the diameter of the CAT (close to 3") compare to the rest of the exhaust (21/4").

 

[Rick]

Cut it off or keep it....Isn't that what Lorena Bobbitt asked herself!!! Dead Link Removed Dead Link Removed

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Rick Horwitz
Editor
explorer@4x4central.com
www.4x4central.com

 

[Weatherman]

A91EB, do you not have to get a state safety and emissions test each year? I live in northern VA and we sure do.

Oh, and I see Rick is familiar with my hometown. Dead Link Removed

 

[4x4Foot]

ok...i have a solution, u can all take your cats off and pass emissions....i live in nc and on our news i heard about a great product....i personaly think everyone should get one....go to www.pure-power.net this is a fuel catalist...30% better mpg and cleans all the carbon out of your engine..and no emissions.

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Currently unmodified 92 4.0 4 door 4wd

 

[Rick]

That Pure-Power deal is as bad as putting magnets around your fuel line. Just another hoax.

I'm amazed at how much money Pure-Power put into it's website to promote a worthless piece of automotive quackery.

You gotta love the spot where it says to hook up the positive wire and no connection to ground. Or just leave the wire off and it will work just as well. That's true cause it doesn't work in the first place!

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Rick Horwitz
Editor
explorer@4x4central.com
www.4x4central.com

 

[4x4Foot]

are you serious have you tried one?

 

[Skip Pendle]

This may sound like dotting the t's and crossing the i's, but I want to support the comments of the others here by repeating a reply I made to a similar question some time ago.

It is precisely the development of the catalytic converter that allows us all to have a choice of some pretty nice vehicles instead of some 25 horsepower, three-wheeled, electro-chemical wonder-wagon that the likes of Al Gore and his greeny buddies would have us all be happy with.

Pre-cat emission controls were terrible. I remember 350 cu.in. V8s with all of 140 horsepower, when they ran at all. I also remember the time when it was more common to see a solar eclipse than the San Gabriel mountains from San Fernando valley! If you haven't had this experience, treat yourself to a couple of days in, say, Mexico City. Just don't forget to pack an oxigen bottle or two. Heck, Tokyo used to have oxigen vending machines on the downtown streets...insert a yen, take a breath.

My point is that we all breath and we all pay the same "penalty", small as it is, of running our engine exhaust through catalytic converters. There are ways to open an exhaust system for power and E.T. gains that do not compromise the air we breath. Removing the cat is not philosophically any different than removing the mufflers and going off-roading through a bone dry forest. Sure, you've got a little more diggin' power and all the fires that you set are behind you, but you leave a hell of mess for the next guy.

And don't for a moment be thinking that a few vehicles with disabled catalytic converters is only a drop in the polution bucket. For most of our techno-nitwit politicians, a few drops are all they need to pass a law having us all being required to install new cats every year or some dumb similar thing.

My 2¢ plus for your consideration.

[This message has been edited by Skip Pendle (edited 03-06-2000).]

 

[Rick]

I agree with Skip 100%. Todays best hot rods are making as much power as the muscle cars from the sixties, even with the converter.

As for 4x4foot. This isn't something I need to try to see if it works. These type of gadgets have been available since the '50s and probably even earlier. IF they REALLY gave you more power, better gas mileage and lower emissions, don't you think Detroit would be using them to help them meet their pollution and fuel economy standards?

All of the testimonals are bull. One of them says it won't void your warranty. Once again, of course it won't void your warranty, it doesn't DO anything. The fuel coming out is the same as the fuel going in. It's not going to burn any cleaner or give you any better gas mileage.

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Rick Horwitz
Editor
explorer@4x4central.com
www.4x4central.com

 

[4x4Foot]

i guess what got me is when my govorner jim hunt endorsed it...i will wait a while for someone else to test it.

 

[A91EBexplorer4x4]

yes your right i am in VA now but im leaving this god awful state and going to the sunshine state.! happy trailing. Later

 

[GJarrett]

Well, your governor Jim Hunt never endorsed it. Did you read his letter? It was just a response stating that he received the letter from this company and said his state needs to look into technology like this, and that he was forwarding this information on to another person who would be contacting the company soon. I didn't see anywhere in the letter where he personally endorsed the product and said he had tried it, etc.

Rick is right; this thing is the same set of claims started long ago but now dressed up with newer techno-speak. Who remembers the Pogue carburetor? I actually bought the plans for that thing back in the early 70s ($15, if I remember correctly). As I recall, its concept was to use captured engine heat off of the exhaust manifold to pre-heat and atomize the gasoline going into the carburetor thus allowing for much more complete burning of the fuel since it was already a vapor and not a liquid. I believe the claim was 50mpg for V-8s. Reading this company's claims sounds very familiar to the Pogue thirty years ago, doesn't it? I wonder if the owner is named Pogue (Pogue Jr? Poguelette?).

If you really want to try this concept out I'll see if I can find those old Pogue plans and you can test it for $15 instead of the $400 this company is trying to fleece you for.

Gerald
'99 EB 4.0 SOHC, 50mpg Dead Link Removed

[This message has been edited by GJarrett (edited 03-06-2000).]

 

[4x4Foot]

ok thanks for savin me 400 bucks

 

[S.Matsushige]

Cutting your CAT out won't effect your computer since the O2 sensor is before the CAT and there isn't one after it, but I got to agree with Skip, Ray and Rick on this issue. I don't want to sound like a jerk, but it would be a selfish act to remove the CAT. Instead you might want to consider a hi-flow CAT as an alternative. Something like a Super Converter by Dynomax. You'll get better performance while being a good citizen at the same time.

 

[RVerdejo]

Totally agree with the majority...keep the cat, or go high flow

On another note, I saw a picture of a Borla muffler in a fishing magazine that had dual inlets AND outlets. Anyone know what model that is, and if so, what the cost might be??

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Don't Worry about things you can control...
Don't Worry about things you cannot control.

96 Eddie Bauer AWD V8
Two other cars that aren't Explorers

 

[PunkChild]

I'm not really a help on this issue but I do have a cat question. How is it possible to have a high-flow cat? Cats are all made the same way, it's only the size and the inlet and exit tube size, right? I'm told it's illeagal to have a cat thats bigger than original equipment. I guess I'm just confused. Thanks if you answer.
Jim