cat or no cat
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Postmaster
Joined: Oct 2005
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From: WARRINGTON, PA
cat or no cat
i have an 01 X limited 4x4 v10. already have a fm muffler and bigger pipe. i heard the sound clips from another thread with different trucks. the question is, how does it perform without the cat??, check eng light???, stinky smell???? i would appreciate only the testamonials from those who have this done to their trucks. i dont need the thoughts of those who think it would be bad, or who say its illeagal. thanks but i dont need that. i know the laws, i am a state inspector and emmisions tester for cars, buses, and tractor trailers.
Posting Guru
Joined: Apr 2003
Posts: 1,089
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From: Michigan
Originally Posted by RACERX7775
i have an 01 X limited 4x4 v10. already have a fm muffler and bigger pipe. i heard the sound clips from another thread with different trucks. the question is, how does it perform without the cat??, check eng light???, stinky smell???? i would appreciate only the testamonials from those who have this done to their trucks. i dont need the thoughts of those who think it would be bad, or who say its illeagal. thanks but i dont need that. i know the laws, i am a state inspector and emmisions tester for cars, buses, and tractor trailers.
For the technicial stuff...Unless your 01 is a California, or green state build, you do not have any post cat O2 sensors. So no, your MIL will not illuminate if you remove the cat. As far as performacne goes, I don't think it would be of any benifit. These cats are pretty big and free flowing. Only if it was really rusted up and the bricks inside were crumbled would exhaust flow be restricted.
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Postmaster
Joined: Oct 2005
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From: WARRINGTON, PA
its not ignoring the law, its just going around it. i am the one who inspects my truck. so i was wondering if it would still pass emmissions. do you have the cat on yours still?
Posting Guru
Joined: Apr 2003
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From: Michigan
Originally Posted by RACERX7775
its not ignoring the law, its just going around it. i am the one who inspects my truck. so i was wondering if it would still pass emmissions. do you have the cat on yours still?
Yes, I have the cat on mine, and it would never occur to me to remove it for any reason. The school of thought that says your veh will run better and get more performance w/o a cat in place went away many years ago. Most people who still believe it are just miss-informed.
Fleet Mechanic
Joined: Mar 2004
Posts: 1,483
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From: SE PA
racer...what's up?
As far as inspection goes..you know the law better than anyone. My understanding is that the vehicle just gets plugged into the OBD port, and as long as no codes come up..it passes.
I have a friend that did a catted X pipe on a Mustang. It passed emissions as it was only plugged in. (I guess there is no visual?) I can say that if I drive behind his car, it stinks bad. Due to that, he is considering some hi-flow cats. He did install simulators to trick the computer into thinking there are cats.
As far as inspection goes..you know the law better than anyone. My understanding is that the vehicle just gets plugged into the OBD port, and as long as no codes come up..it passes.
I have a friend that did a catted X pipe on a Mustang. It passed emissions as it was only plugged in. (I guess there is no visual?) I can say that if I drive behind his car, it stinks bad. Due to that, he is considering some hi-flow cats. He did install simulators to trick the computer into thinking there are cats.
Posting Guru
Joined: Aug 2006
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From: High Point, NC
In NC, they do an OBD and visiual inspection - so even if the OBD passes, if you have removed the cats, then it fails. Of course, that depends on where you get it inspected and weather or not the inspector crawls under and looks.
I agree with rlh68050 - 25 years ago, it would have made a difference (plus you could have run Leaded gas (remeber those days)), but today the cats are so much better that there would be little if any difference.
I agree with rlh68050 - 25 years ago, it would have made a difference (plus you could have run Leaded gas (remeber those days)), but today the cats are so much better that there would be little if any difference.
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Postmaster
Joined: Oct 2005
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From: WARRINGTON, PA
cat or no cat
now i'm getting thoughts. i do know the laws as i am an inspector. but technically alot of things now fail. yes matt, it just plugs in and the sniffer goes in the rear. but on the X, it only gets an idle test, no dyno. so with no cat, you just have to get the engine very warm before you do the test. since there is no downstream o2 sensor, it shouldn't throw a MIL. i have the cat off my dodge ram (97 2500 4x4 5 speed 360-v8 detroit lockers 5.13 gears 8" lift and 39"tires) and it made a huge difference. stinky though. and loud---whew!!!
thanks for the replies. after this, i see that there is no real proven benefit to removing it. unless i want a loud truck. i already have a fm 3 chamber on it. still a little too quiet.
thanks for the replies. after this, i see that there is no real proven benefit to removing it. unless i want a loud truck. i already have a fm 3 chamber on it. still a little too quiet.
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