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Can I tune out codes to pass emissions?

This is a discussion on Can I tune out codes to pass emissions? within the External Engine forums, part of the LSx Technical Help Section category; I was wondering if I go with a catless y pipe (to save $200 and be louder) could i get ...

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    Rice Hungry GottaHaveLS1's Avatar
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    Can I tune out codes to pass emissions?

    I was wondering if I go with a catless y pipe (to save $200 and be louder) could i get the rear 02's tuned out (or get 02 sims) just like if i had a catted y and still pass emissions. I'm in CT and i dont think there is any visual/sniffer test.
    1999 Trans Am M6
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    Tuned at Mongillo Motors in New Haven, CT

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    SS#430 1 of 74 7camaro7's Avatar
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    I need to know too!

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by GottaHaveLS1 View Post
    I was wondering if I go with a catless y pipe (to save $200 and be louder) could i get the rear 02's tuned out (or get 02 sims) just like if i had a catted y and still pass emissions. I'm in CT and i dont think there is any visual/sniffer test.
    As long as they only plug into the OBDII port for 96+ vehicles (as in NJ) you should be fine. They trust that the computer will supply the necessary information about the status if the emmissions system. They aren't counting on you having O2 sensors tuned out

    When I went to inspection, the one guy did open my hood though. It was all stock besides the lid, but I guarantee this moron had no idea what he was looking at anyway.

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    Senior Member ss~zoso~ss's Avatar
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    yea u can get them tuned out or simmed, but if they look under the car ur screwed (if they care enough)

    or if u get pulled over by the cops they'll have you take the LT's off because they are illegal in all 50 states

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    SS#430 1 of 74 7camaro7's Avatar
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    that would suck!

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    yea u can get them tuned out or simmed, but if they look under the car ur screwed (if they care enough)

    or if u get pulled over by the cops they'll have you take the LT's off because they are illegal in all 50 states
    What cops are going to pull you over and check your exhaust manifolds??

    That only happens in California, where they are emmissions Nazis.

    And they can't make you take off anything anyway. They would give you a "fix it" ticket which means you are supposed to address the "issue" within a certain amount of days. They aren't going to confescate your LT's, please

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    Senior Member ss~zoso~ss's Avatar
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    Quote Originally Posted by Wesman View Post
    What cops are going to pull you over and check your exhaust manifolds??
    the ones that are giving u a ticket for loud exhaust/disturbing the peace

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    Rice Hungry GottaHaveLS1's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    yea u can get them tuned out or simmed, but if they look under the car ur screwed (if they care enough)

    or if u get pulled over by the cops they'll have you take the LT's off because they are illegal in all 50 states
    In my town my friend has gotten pulled over several times for noise/burnouts/speeding in his 94 GT with LT's and off road H. They ask him if it's legal and he said he has no idea cuz it's his mom's car (under her name). I don't think they can do shit in CT unless they really wanna be a dick.

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    Senior Member ss~zoso~ss's Avatar
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    yea but usually they are lol

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    the ones that are giving u a ticket for loud exhaust/disturbing the peace
    Yea...but thats a big difference from what you said. They can give you a ticket for excessive noise, but they can't "make you take your LT's off".

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    yea but usually they are lol
    Beat me to it.

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    Rice Hungry GottaHaveLS1's Avatar
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    Do you think we could get back on topic? I'd like to know if i can just get the rear 02's tuned out if I don't get cats. Does it work the same if i were to get cats? I'd really like to save the $200 from buying them...

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    Senior Member INMY01TA's Avatar
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    You can have tuned out by a shop with the right software, buy LS1 Edit or HP Tuner yourself and tune em out or use 02 simulators. 02 sims would proly be the cheapest route. I had mine tuned out and have passed twice.

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    Rice Hungry GottaHaveLS1's Avatar
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    hmmm yea that sounds like the best bet. So since it doesnt matter if i have cats or not (no visual/sniffer test) then i might as well ditch em and get 02 sims. The sims will take care of the codes and i should pass.

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