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LT header illegal?

This is a discussion on LT header illegal? within the External Engine forums, part of the LSx Technical Help Section category; I recently read a brief statement that said LT headers are illegal. Is this statement true? and if so why ...

  1. #1
    Join Date
    Nov 2006
    LI New York

    1999 Trans Am

    LT header illegal?

    I recently read a brief statement that said LT headers are illegal. Is this statement true? and if so why would they be illegal? Any info about this would be great, this was the first time i have ever herd such a thing and wanted to know if it was true or not.

  2. #2
    Senior Member Danger731's Avatar
    Join Date
    Aug 2000
    For smog reasons. If you get LT's the Cats have to be moved which is against the law due to emmisions.

  3. #3
    Pathelogical Liar BlackLT1Z28's Avatar
    Join Date
    Aug 2006

    94 Camaro Z28

    Longtubes move the factory placement of the cats, therefore making them illegal via visual inspection. However, if your area doesn't conduct visual inspections, it is possible to pass emissions with longtubes with either O2 sims, delete the code w/ a tune, or use a pair of cats on the new y-pipe.

  4. #4
    Member 89LX's Avatar
    Join Date
    May 2006
    East Coast North Carolina

    2000 Z28 M6

    Prison Time.... Ha!!

    You shouldn't get prison time for it but depending on who does the inspection you may fail emission visual test. If the cats are moved aft and done properly (not sloppy work) the average local inspection (gas station) folks may not even know the difference. I wouldn't of course take it to a dealership and hope to slide it by them. If they spot it no harm and no foul...they will simply tell you. You then say something like "damn...I purchased this car used and never thought about checking the exhaust". Off you go and try another or have a stock system ready for install in order to pass.
    2000 Z28 M6, SLP Lid, SLP Bellows, SLP UD,
    P&P Maf, TB By-Pass, PS Shorties, LS6 Intake, FAST 78mm TB, Hooker CB, Hurst Billet, Front Tower Brace, small 218/218....527/527....114 cam.

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