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Effects of taking out my cat?

This is a discussion on Effects of taking out my cat? within the Firebird / WS6 forums, part of the Vehicle Specific category; What would the effects be of taking out my catalytic converter and putting a straight pipe where the cat was? ...

  1. #1
    Member Dave-TransAm's Avatar
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    Effects of taking out my cat?

    What would the effects be of taking out my catalytic converter and putting a straight pipe where the cat was? I know its going to throw up the check engine light but what else will it do? Thanks for the help.

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    It will be louder.

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    Senior Member JayTA98's Avatar
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    wont the odor of fumes be stronger also?

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    Senior Member 98maro's Avatar
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    Member Dave-TransAm's Avatar
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    What kind if tune would I need? And how much would it be?

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    blah '02 WS6's Avatar
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    Custom tune......runs about $300-400.
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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by Dave-TransAm View Post
    What kind if tune would I need? And how much would it be?
    you'd just need the rear 02's tuned off... you could get 02 sims but they only last for so long...

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    Member Dave-TransAm's Avatar
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    Quote Originally Posted by Spaz View Post
    you'd just need the rear 02's tuned off... you could get 02 sims but they only last for so long...
    How do I turn em off?

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    Moderator 35th-ANV-SS's Avatar
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    You get them tuned out or you get 02 simulators like mentioned already.

    The first choice would be to get them tuned out.

    And no, you DO NOT need a tune if you remove your cats.

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    O U 8 1 2 Spaz's Avatar
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    oh... you'll gain maybe 1 or 2 rwhp...

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    blah '02 WS6's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    You get them tuned out or you get 02 simulators like mentioned already.

    The first choice would be to get them tuned out.

    And no, you DO NOT need a tune if you remove your cats.
    Eventually the computer will learn itself and no longer be fooled by the sims. General idea is if you have to use credits just to tune out rear 02s...might as well tune car.

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    Moderator 35th-ANV-SS's Avatar
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    Correct, but you do not have to get them tuned out if you are not bothered by the SES light or if you do not have to have emissions.

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    Member Dave-TransAm's Avatar
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    So when I go to emissions in 2012 how long before then should I put the cat back on?

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    blah '02 WS6's Avatar
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    You could always hollow the cats out or have an exhaust shop fab you a "test-pipe" that looks similar to the likes of a high flow cat. That's a popular alternative for those with visual inspections and no sniffer tests.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    You get them tuned out or you get 02 simulators like mentioned already.

    The first choice would be to get them tuned out.

    And no, you DO NOT need a tune if you remove your cats.
    This....

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by '02 WS6 View Post
    You could always hollow the cats out or have an exhaust shop fab you a "test-pipe" that looks similar to the likes of a high flow cat. That's a popular alternative for those with visual inspections and no sniffer tests.
    Most exhaust shops will NOT work on your car if your catalytic converters have been removed or if you have LT's which cause the cats to be moved from their original location.

    Not having catalytic converters is illegal and an exhaust shop tampering which such a car or removing the cats can be heavily fined.

    Not sure if this is a state law or federal as it deals with emissions. Guessing state law.

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    blah '02 WS6's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Most exhaust shops will NOT work on your car if your catalytic converters have been removed or if you have LT's which cause the cats to be moved from their original location.

    Not having catalytic converters is illegal and an exhaust shop tampering which such a car or removing the cats can be heavily fined.

    Not sure if this is a state law or federal as it deals with emissions. Guessing state law.
    For exhaust shops that do inspections I can see that, but there is also the excuse of "Doing this on my 'race car'' which doesn't need explanations to a shop. There are ways around everything...except in Cali maybe.

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    Member Dave-TransAm's Avatar
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    Arizona does the whole test the exhaust deal so I would need to put the cat back on before emissions. I was just going to get it so I can bolt it right back on when I need to go. And im going to buy a used catalytic converter so i can have them hollow it out and run the pipe through it when I get the straight pipe put in in place of the cat

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    Quote Originally Posted by 35th-ANV-SS View Post
    You get them tuned out or you get 02 simulators like mentioned already.

    The first choice would be to get them tuned out.

    And no, you DO NOT need a tune if you remove your cats.

    Agree. Although the exhaust will be less restrictive, the combination of feedback from the front O2 senders and MAF will more than compensate for the change in airflow through the engine.

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    Senior Member Too Fast's Avatar
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    Agree also.

    You don't even need a tune with LTs. Ask me how I know....but as we all agree, a tune benefits any car.

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