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no cats?

This is a discussion on no cats? within the GTO forums, part of the Vehicle Specific category; i was looking through a list of header selections and was wondering if i removed the cats will i get ...

  1. #1
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    2004 gto

    no cats?

    i was looking through a list of header selections and was wondering if i removed the cats will i get a check engine light? and if so what would i have to do to get it removed?

  2. #2
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
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    Most likely yes unless you get a tune to adjust the O2 sensors to read correctly.

  3. #3
    Moderator 35th-ANV-SS's Avatar
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    Correct, the SES light will show because your rear O2 sensors will no longer be sending the correct voltage signal output showing the cats are not working properly (since they're aren't there).

    Two ways to remove the SES light. Get them tuned out (most likely recommended) or purchase O2 simulators. Some people have issues with the O2 simulators though so that is why a tune is recommended.

  4. #4
    Junior Member okay469's Avatar
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    Get a tune if you want the cats out.If your just lookin to be loud just delete the mufflers.

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    do you still get a read if i put high flow cats?

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    Member speedyWS6's Avatar
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    2002 WS6 TA

    I played this game recently and once i gutted my SLP cats i had the SES light looking at me and as per advice from these wonderful people i was assured it would not run badly or harm anything as it is just seeing a wrong "after cat" reading and a bit confused..that's all!

    Equally.... when i replaced the gutted cats with a pair of hi flow cats from Race parts Direct in MO the light went out again and remains out all the time so you should be fine if you go that route!

    Even messing around with a new Magnaflow muffler never bothered the light!!

    Trev... )

  7. #7
    Smiles for 9.5 Years cammed goat's Avatar
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    High flow cats won't trip the light.

  8. #8
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    cool, i know it doesnt really affect performance but when you have a nice car it sux to see that light lol

  9. #9
    Smiles for 9.5 Years cammed goat's Avatar
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  10. #10
    Member Skippy's Avatar
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    I did the ol' spark plug anti fowler trick on mine with no cats and so far ive turned about 15000 mi. and no light to date. I even drove it from central OK to St. Louis this past week with no problems.
    Ashes to ashes and dust to dust, if it wasn't for fords our tools would rust

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    Quote Originally Posted by Skippy View Post
    I did the ol' spark plug anti fowler trick on mine with no cats and so far ive turned about 15000 mi. and no light to date. I even drove it from central OK to St. Louis this past week with no problems.
    how is that done?

  12. #12
    Member Skippy's Avatar
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    You take two spark plug anti fowlers (can be purchased at local parts stores for about $5 a pair) Drill one out to a 5/8 hole and screw it into the other non drilled one. Thread the pair into the eaxhaust and then thread the O2 into the pair. It only allows a small amount of exh. to reach the sensor so it trickt the ecu into thinking all is well. it takes one pair per O2 sensor. So far mine has worked without any issues.

  13. #13
    Member Skippy's Avatar
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    Sorry, drill the one to 1/2 not 5/8. I found a good write up on another thread site.http://www.svtperformance.com/forums...-how-make.html

  14. #14
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    Quote Originally Posted by Skippy View Post
    Sorry, drill the one to 1/2 not 5/8. I found a good write up on another thread site.http://www.svtperformance.com/forums...-how-make.html
    sweet, i think ill go the test pipe route n save my self 300 bucks

  15. #15
    Exalted Cyclops 67CamaroRSSS's Avatar
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