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Remove Cats & rear O2's

This is a discussion on Remove Cats & rear O2's within the External Engine forums, part of the LSx Technical Help Section category; My ride is a '35 Buick street rod with a 1999 LS1. I plan to remove the Cats & rear ...

  1. #1
    Junior Member
    Join Date
    Oct 2012
    N. Georgia

    1935 Buick (Street Rod)

    Cool Remove Cats & rear O2's

    My ride is a '35 Buick street rod with a 1999 LS1. I plan to remove the Cats & rear O2's. What is the down side of not programming out the O2's, just leaving them disconnected?

  2. #2
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    If you wire up a check engine light it'll stay on all the time unless you tune out the codes. Codes for the rear O2's can easily be tuned out for around $150. Highly recommend "Tuned by Frost" for a mail order tune on your PCM. The engine and trans (if you are running an e-trans) will be much happier with his tweaks.

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