Catylitic converter...do i need it?
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Professional
Joined: Dec 2008
Posts: 220
Likes: 1
From: Northwest Territories, Canada
Catylitic converter...do i need it?
Yup, another silly exhaust question. Im gonna build a cat-back on my 02' 4.7 ram this spring. Just wondering if this engine really needs a cat or if it will run better without it. I know some engines run much better with the additional back-pressure created by cats. Not sure what muff im goin with yet. Also, what pipe diameter are most of the cat-back kits out there? Thanks.
All Star
Joined: Apr 2007
Posts: 958
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From: Southwest, Pa
"I believe there are also oxygen sensors in the cat that the engine needs"
There not in the cat itself, before and after to be exact
You can run no cat but you will have to get a o2 sim for the rear sensor, so you wont throw a check engine light. the rear o2 just tells the pcm that the cat is working
There not in the cat itself, before and after to be exact
You can run no cat but you will have to get a o2 sim for the rear sensor, so you wont throw a check engine light. the rear o2 just tells the pcm that the cat is working
Banned
Joined: Sep 2005
Posts: 7,759
Likes: 1
Yup, another silly exhaust question. Im gonna build a cat-back on my 02' 4.7 ram this spring. Just wondering if this engine really needs a cat or if it will run better without it. I know some engines run much better with the additional back-pressure created by cats. Not sure what muff im goin with yet. Also, what pipe diameter are most of the cat-back kits out there? Thanks.
Professional
Joined: Jan 2006
Posts: 124
Likes: 0
From: Chula Vista CA
You will get a Check engine light if you remove them the 02 sensor after will detect it. the mild performance gain is not that significant. How many Cats does your truck have? if 3 make your new exhaust replacable before the third one, that way you can swap back and not get the engine codes. I think 
Veteran
Joined: Jun 2008
Posts: 428
Likes: 2
From: Ohio
Yeah, it's illegal, which in some areas where you don't have inspections you'll probably be alright.
But hey, as if driving a 12 MPG truck wasn't bad enough, why don't you just go ahead and throw all those pollutants into the air?
Matter of fact, you should put your trash in the bed of your truck too, so it can blow out while you are driving, that way you won't have to pay for trash pickup.
But hey, as if driving a 12 MPG truck wasn't bad enough, why don't you just go ahead and throw all those pollutants into the air?
Matter of fact, you should put your trash in the bed of your truck too, so it can blow out while you are driving, that way you won't have to pay for trash pickup.
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Rookie
Joined: Sep 2008
Posts: 90
Likes: 0
From: Norway
what gains?
is there any gain in power if you remove the cat?
This depend on what enginge you have- i think!!!
so with my 5.9L engine, do I realy gain any power or MPG?
maybe it is only sound that is the real gain
This depend on what enginge you have- i think!!!
so with my 5.9L engine, do I realy gain any power or MPG?
maybe it is only sound that is the real gain
I Beat Tetris
Joined: Jan 2008
Posts: 2,953
Likes: 2
From: Orlando
All legal reasons aside, running with no cats on the 4.7 will cost you a noticeable amount of low end torque. Although if you are determined to run with no cats, simply gut them and put O2 simms on so you'll pass inspection.
