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Can I pass inspection with long tube headers?

This is a discussion on Can I pass inspection with long tube headers? within the External Engine forums, part of the LSx Technical Help Section category; I would like them but I don't want to put them on then find out I can't legaly drive my ...

  1. #1
    Member Kup98ss's Avatar
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    Can I pass inspection with long tube headers?

    I would like them but I don't want to put them on then find out I can't legaly drive my car any more.
    What are your experiences with inspection stations.

    Thanks.

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    member since may 2000 nhraformula's Avatar
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    it all depends on the laws of your state.
    here in illinois, they dont look under the car so if you have headers, make sure they get tuned so you pass emissions.
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    Call Jeff at Carolina Auto Masters in Durham NC. I dont have the number on me but look the shop up on the net. carolinaautomasters.com. If any body around NC or SC knows he does.

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    Member Kup98ss's Avatar
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    I live in N.C. I heard most places don't look for the cats although they are supposed to. Will there be any different readings from the exhaust when they try to read it. Or hell, do they even read exhaust measurements in NC.

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    Member Kup98ss's Avatar
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    Quote Originally Posted by M&M T/A View Post
    Call Jeff at Carolina Auto Masters in Durham NC. I dont have the number on me but look the shop up on the net. carolinaautomasters.com. If any body around NC or SC knows he does.
    I might give it a shot. Thanks.

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    Ive got long tube Pace setter headers and 3 inch to the hooker muffler, SLP air box, Cam and torque convertor changed and Jeff did my dyno tuning. He is a great person to deal with. My T/A runs 11.80s flat at 115 mph in the 1/4 & 7.50s in the 1/8. If you do what I did plan on changing the carrier in the rear end, (weak with good tires, mine broke).

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    Kup98SS...where in NC are you? im looking at getting LT's and the TSP true duals for my 02 z28, and i had the same question as you. let me know if you find out!

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    Member BlackSS1's Avatar
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    I am sitting on the same fence - wanna do LTH with a catted Y, but moving cats is not legal in NC... Any advice from NC guys? Can you get these through inspection?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by BlackSS1 View Post
    I am sitting on the same fence - wanna do LTH with a catted Y, but moving cats is not legal in NC... Any advice from NC guys? Can you get these through inspection?
    Yes, with a tune it will go through emissions as long as they let the visual go.

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    Member Kup98ss's Avatar
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    could you put the CATs on the end of the LTs or is that just dumb? How about midlengths?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by Kup98ss View Post
    could you put the CATs on the end of the LTs or is that just dumb? How about midlengths?
    Yes, you can put the cats directly after the LTH's. Midlengths also are not carb legal and you will see less of a gain for around the same cost.

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    Member Kup98ss's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Yes, you can put the cats directly after the LTH's. Midlengths also are not carb legal and you will see less of a gain for around the same cost.
    Pardon my ignorance but why do LTs make more carbons. Will it be worth getting headers if I'm just going to put cats on them?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by Kup98ss View Post
    Pardon my ignorance but why do LTs make more carbons. Will it be worth getting headers if I'm just going to put cats on them?
    Yes, LTH's will make more power w/ cats than MLH's w/ cats.

    LTH's & MLD's are not as efficient at eliminating emissions as factory designed systems are. When you cold start an engine, it takes a while for the cat to heat up. When the cat is cold, it does not do its job of eliminating harmfull emissions. The shorter the distance from the exhaust manifold to the cat, the less heat escapes which is less efficient. This is one of the biggest reasons that midlength and LT headers are illegal. They do not get to the operating temp.'s that carb legal parts do.

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    Member Kup98ss's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Yes, LTH's will make more power w/ cats than MLH's w/ cats.

    LTH's & MLD's are not as efficient at eliminating emissions as factory designed systems are. When you cold start an engine, it takes a while for the cat to heat up. When the cat is cold, it does not do its job of eliminating harmfull emissions. The shorter the distance from the exhaust manifold to the cat, the less heat escapes which is less efficient. This is one of the biggest reasons that midlength and LT headers are illegal is for this reason.

    Thanks for the good answer.
    So even if I have CATs on there, my car will fail inspection if the guy checking it out see's headers. Is that correct?

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Kup98ss View Post
    Thanks for the good answer.
    So even if I have CATs on there, my car will fail inspection if the guy checking it out see's headers. Is that correct?
    correct unless you have shorty headers which are a waste of money

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    Member Kup98ss's Avatar
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    How do all of you guys manage to have headers on your car? Do you just take the risk?

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    Move to florida...we don't have emissions testing

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Kup98ss View Post
    How do all of you guys manage to have headers on your car? Do you just take the risk?
    if you live in a state that only does odb, you have a tuner delete the emissions program. you pass everytime then

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    Senior Member 01ws6er's Avatar
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    Quote Originally Posted by Kup98ss View Post
    How do all of you guys manage to have headers on your car? Do you just take the risk?
    I live in PA and they ODB and visual test, but most shops don't really care about visual... Also, in PA if you drive under 5,000 miles/ year or spend $150 on parts and labor to get (emissions) stuff "fixed" you get an excemption. Call your DMV and see hwat they say about the laws, and then ask around to find a shop that might be willing to look the other way. I'm getting headers soon, and I'm kinda hoping I don't get caught with a visual... Good luck!

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    I lived in BOULDER COUNTY for eight years and its... BOULDER!!! and i passed emissions with longtubes... Had to go with a more restrictive exshaust plate on the blorla system but passes and then took the restricter plate off...

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