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  1. O2 check engine headers or cat delete

    Just for clarification I passed Emissions with no cats with foulers and stock tune.

  2. O2 check engine headers or cat delete

    Correct. O2 Foulers will treat the sensors as if stock / with cats.

  3. O2 check engine headers or cat delete

    I have the same Kooks system; Long tube headers 3" + cat delete with a 1 7/8" H pipe setup. This will not throw an engine light, but it will not pass emissions. I passed the emissions test here in NH with spark plug foulers. I originally bought these...


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