changing cat converters out when changing muffler?

Discussion in 'Performance' started by BlueCollarTahoe, Jul 11, 2018.

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  1. BlueCollarTahoe

    BlueCollarTahoe Full Access Member

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    looking to put a flowmaster 44 on the truck soon...was wondering is it worth changing the cats while im at it? theyre the factory ones and truck is at 112k miles. im in NYC so they have to pass the emissions test

    2004 tahoe 5.3 v8 lt
     
  2. BlueCollarTahoe

    BlueCollarTahoe Full Access Member

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    bump
     
  3. swathdiver

    swathdiver Full Access Member

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    She's almost fifteen years old and the mileage is about when mine went bad. If you have the funds do it. Don't skimp out and get cheap no name brands, they'll choke your motor and do not last. I bought the Magnaflow Y-Pipe with cats for mine. Flowmaster 44s, you'll be hard of hearing soon enough if you're not already! Sound great though. You adding a resonator to kill the drone?
     
  4. Doubeleive

    Doubeleive Elite Member Supporting Member

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    I would say no unless you have been driving the piss out of it for a good long time then the cat's should be fine, you will want to change the 02 sensors though (all of them) there only rated for 100k but could go longer
     
  5. BlueCollarTahoe

    BlueCollarTahoe Full Access Member

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    shes a strong old woman lol no resonator! lets hear the drone!!! you got a parts number for that set up? i was looking at whole setups from magnaflow and flowmaster. ill save up to get it done.

    i changed the driver side 2 maybe 10k miles ago....the passenger side ones are the stock ones from the factory.
     
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  6. swathdiver

    swathdiver Full Access Member

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    51578 but that is for mine, plug in your specs and see what comes up.
     
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  7. HoeRyder26

    HoeRyder26 Member

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    I wouldn't bother. Unless you have a check engine light on for the efficiency or you feel like you have lost power, you would be wasting your money. You would be surprised how good the stock cats flow.
     
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  8. BlueCollarTahoe

    BlueCollarTahoe Full Access Member

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    is there a full proof way to test their efficiency? even a test a diag shop can do? or is that what the 02 sensors are for?
     
    Last edited: Jul 15, 2018
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  9. swathdiver

    swathdiver Full Access Member

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    Reading the O2 sensors or you could put a bore light camera in the holes and look at the honeycombs.
     
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  10. BlueCollarTahoe

    BlueCollarTahoe Full Access Member

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    gonna go on a trip soon where i can graph them at diff speeds over time will update soon
     
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