Well I think I want to gut the cats on my 4.7. From what I can see, I have 2 bolt on cats, one right after each header. I was wondering what the chances were of my truck throwing a code and weather or not it will run like crap. I am also curious how it will sound with my Flowmaster 40 Delta muffler.
gutting the cats
mopardakota287
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Well I think I want to gut the cats on my 4.7. From what I can see, I have 2 bolt on cats, one right after each header. I was wondering what the chances were of my truck throwing a code and weather or not it will run like crap. I am also curious how it will sound with my Flowmaster 40 Delta muffler.
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yes sir
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625 Posts
If I were to do this on my '97, what would I use for an O2 sim?
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12,273 Posts
No sim needed, tie the 02 while connect to the frame rail.
what to do?
Ive got a very similar issue and cant find what to do exactly.
ive got a 01' dakota 4.7 v8
its got the 3 cat system to cali emissions
My passenger front cat is rattling. so my plan is to have the front cats gutted, bypass the third, and run a aftermarket cat back system. however of cores im concerned about throwing codes. Do i get a simulator for the 2 post cat sensors? tie them to the frame? will the spark plug anti fouler system work? i understand that my second sensor just needs a different reading than the first, but what about the heating aspect? will it not throw a code for that if tied to the frame? too many variables, im not knowledgeable enough, some insight here would be great, thanks.
p.s if i need sims what do i get? o2simulator.com universals? (if so do i need the heat sensor sim?) fastman??? please feed me with knowledge. o and im not concered about emission tests, none'a that around here
Ive got a very similar issue and cant find what to do exactly.
ive got a 01' dakota 4.7 v8
its got the 3 cat system to cali emissions
My passenger front cat is rattling. so my plan is to have the front cats gutted, bypass the third, and run a aftermarket cat back system. however of cores im concerned about throwing codes. Do i get a simulator for the 2 post cat sensors? tie them to the frame? will the spark plug anti fouler system work? i understand that my second sensor just needs a different reading than the first, but what about the heating aspect? will it not throw a code for that if tied to the frame? too many variables, im not knowledgeable enough, some insight here would be great, thanks.p.s if i need sims what do i get? o2simulator.com universals? (if so do i need the heat sensor sim?) fastman??? please feed me with knowledge
. o and im not concered about emission tests, none'a that around here
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stupid question but I am gonna ask anyway WTF is o2 simulator. I want to cut the cat off my 4.7 , can I and still have it run ??????? :waiting:
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12,273 Posts
It will run, but run codes. Up until 2000, 50/50 on 2000 models you can go without an o2 sim.
You have 2 sensors, pre cat and aft cat (before and after). The pre(first) judges air and fuel for combustion based upon burned fuel. Aft/second basically tells the pcm/computer that the cat is or isn't working.
The sim fools the computer in thinking that the cat is working(good/present).
I don't really understand the thrill with gutting or removing cats either. I have no emmissions testing here, and I will still replace them if they fail. I've ran my car without for quite some time(ever since I boosted it) and it stinks, its dirty, no reason to throw that stuff into the air.
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625 Posts
Word. I've never known anyone to get hassled about cats in MN, but I still run them on my newer stuff. My friends hassle me about getting rid of it, but hell, I just bought a new one to replace the rattly one on my truck. I'm not building a race truck, so no reason for me not to have one. Also, I won't have any issues when I go to sell it and some hippie wants to buy it.
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324 Posts
What one really needs to be concerned with is it's illegal to remove/mod a cat.
matters not whether you have emissions testing, it's illegal.
matters not whether you have emissions testing, it's illegal.
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12,757 Posts
Even at that, you can get higher flowing cats that create no restrictions in your exhaust and still do the job. The only reason I don't have cats is because the previous owner had cut them out. When I do the engine in mine, I will have cats in it.
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