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Can I remove my catalytic converters on my 2003 Sierra

This is a discussion on Can I remove my catalytic converters on my 2003 Sierra within the Technical / Maintenance forums, part of the General Discussion category; Any answers??? Thanks, Mike...

  1. #1
    Country Boy Reddawg's Avatar
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    Can I remove my catalytic converters on my 2003 Sierra


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    Any answers??? Thanks, Mike
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    Forum Leader oneloudz71's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    Yes you can. You will throw codes and get a check engine ligt, but you can get around that with a tune or O2 sims.

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    Country Boy Reddawg's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    10/4 Thanks man!!
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    Registered User hornsfan10609's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    Depends on local emissions laws as well. Here in austin, texas we must have cats or they will not pass the inspection and you can't get a new sticker.

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    20 Inches Strong 00'blackout's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    one question...why?

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    Get in sit down hang on. SolMan98's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    Can you?

    Of course you can.

    Just be prepared to pay the $10K+ fine if you get caught. Then have to go through the hassle to try and sweet talk someone to put then back on. They flow fine, leave them on.

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    Last edited by SolMan98; 04-17-2007 at 05:00 AM.

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    Twins Dad sp3edr4cer's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    In Louisiana you are suppose to have them to but most inspection places just make sure your horn and windshield wipers work along with all your lights. and if they do then you get a sticker. Most everyone in this area if they have removed their cats they also remove the muffler and run straight pipes. and they still get the sticker every year.
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    do what i did... i just sliced the cat open and used a crowbar and hammer to knock out the honeycomb insides of the cat. and just welded a little bead to close it back up and presto.. hollowed out cat.. sounds mean and did not throw a code. Keep in mind this was a 95 z71 with a 350 not the new 5.3

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    Knuckle Buster Coefficient's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    Yes you can remove them but I would leave the cats there since there are 2 of them for duals. The obs trucks like mine had one cat, y pipe restricted mess for an exhaust, it had to come out.

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    Registered User BackToChevy's Avatar
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    Re: Can I remove my catalytic converters on my 2003 Sierra

    You can do anything you want to your truck.
    However, the cats and all other emissions equipment is there for a reason and there are federal laws that stipulate you cannot remove or negatively alter your emissions control equipment.
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