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This is a discussion on converter within the External Engine forums, part of the LSx Technical Help Section category; Hey guys, If I cut my cat and weld a pipe in its place, would it 1) cause the rear ...

  1. #1
    Junior Member hartsmike's Avatar
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    converter

    Hey guys,

    If I cut my cat and weld a pipe in its place, would it 1) cause the rear O2 sensor to malfunction and 2) how would it sound?


    Thanks

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    Senior Member rajiv1998's Avatar
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    SLP makes a y-pipe that hooks up to the factory manifolds to help eliminate cats, or you could get a mufflex custom y pipe. Yeah its gonna throw codes off but you can get it deleted. Do u have headers or is ur exhaust modified at all? If its all stock, ur not gonna notice much of a differnace, it might be just a little louder.

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    Senior Member t-rock's Avatar
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    if your on a budget guttem your self and have someone delete them.

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    Junior Member hartsmike's Avatar
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    how do you get rid of the codes? Once it comes up and you delete the code, will it come back?

    Thanks,

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    Your dealership guy konigandy6's Avatar
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    You a couple options:
    1.) You can go to a tune shop and get someone to tune the codes right out of your PCM. Expensive, but you will get one hell of a tune!

    2.) Order yourself some O2 simulators. They will mimic the signal of a good and working O2 sensor. This is what ive done to mine for the time being. You only need to buy 2, since the only 02 sensors that will throw a code if cats are deleted are the 2 downstream...the furthest back on the exhaust. Cost is about $80-$100. Of course, they will not last forever like a tune will.

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    Junior Member hartsmike's Avatar
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    Well, I'm on a budget and talked to the guy at the local muffler shop. Are the sensors in the converter or are they after the converter? Had the guy that true dualled my 97 ram to torch a hole in the pipes and reinsert the sensors into the pipes.


    Autozone has the free of charge check thing. Will it erase those codes?

    Thanks again guys

  7. #7
    Your dealership guy konigandy6's Avatar
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    Quote Originally Posted by hartsmike View Post
    Well, I'm on a budget and talked to the guy at the local muffler shop. Are the sensors in the converter or are they after the converter? Had the guy that true dualled my 97 ram to torch a hole in the pipes and reinsert the sensors into the pipes.


    Autozone has the free of charge check thing. Will it erase those codes?

    Thanks again guys
    You have a pair of sensors located before the converter, and a pair of them located after the converters. The ones that will give you codes when the converters are removed are the "after" converter sensors. And even when the code is cleared it will come back. You actually have to tune the code completely out of the PCM or buy the simulators to fool the PCM. When the code is edited out of the vehicle software, it will never come back on...ever.

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    Junior Member hartsmike's Avatar
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    Where or what kind of shop will be able to do that? I don't know of many places here in Tn that are equipped to do stuff like that. I think Hypertech is located in Memphis though.

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    Your dealership guy konigandy6's Avatar
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    Quote Originally Posted by hartsmike View Post
    Where or what kind of shop will be able to do that? I don't know of many places here in Tn that are equipped to do stuff like that. I think Hypertech is located in Memphis though.
    Well to tune the software you would have to some research and find an LS1 tune shop around your area. It can get pricey though.

    To plug the simulators in, all you need is a jack and some crappy clothes. You just unplug the wiring from the furthest back o2 sensors, and plug those wires into the simulators....it really is idiot proof. You can leave the o2 sensors in the exhaust tubing, they wont hurt anything, or you can take them out and plug the holes with a bolt.

  10. #10
    Junior Member hartsmike's Avatar
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    where can I find the sensors?

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    Member red99ws6's Avatar
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    jegs has O2 simulators
    where are you at in tn

  12. #12
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    Quote Originally Posted by hartsmike View Post
    where can I find the sensors?
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    Quote Originally Posted by hartsmike View Post
    Well, I'm on a budget and talked to the guy at the local muffler shop.
    If you are on a budget, why are you doing this in the first place? Unless the cat is bad there is no real point. If sound is what you are looking for, get a flowmaster muffler. If its performance, get a lid.

  14. #14
    Your dealership guy konigandy6's Avatar
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    Quote Originally Posted by hartsmike View Post
    where can I find the sensors?
    On the exhaust pipes. You will see the 2 converters, and right before and right after there are the o2 sensors sticking out of the exhaust piping.

  15. #15
    Junior Member hartsmike's Avatar
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    The comb inside the converter is rattling. I'm in southern middle tn. I really like the sound of vehicles. Always been a pickup guy so we true dualled the exhaust with glasspacks for mufflers.

  16. #16
    Your dealership guy konigandy6's Avatar
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    Quote Originally Posted by hartsmike View Post
    The comb inside the converter is rattling. I'm in southern middle tn. I really like the sound of vehicles. Always been a pickup guy so we true dualled the exhaust with glasspacks for mufflers.
    Well I love the sound of vehicles as much as the next guy.....

    If the converter is rattling you need a new one or you need to gut it or cut it off.

  17. #17
    Junior Member hartsmike's Avatar
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    I'd rather cut it out and be done with it but at the same time, I don't want the engine light to stay on.

    On my 97 1500 dodge, the factory sensors were put back in place in the pipe. About a year and a half later, the light came on. I checked the code and it said one of the sensors failed. After about six months, the light went off and stayed off for a while. Every once in a while (probably when they changed the fuel mixture) the light would come back on. Will the TA do that if I cut the cat?

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