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  1. #1
    Jr. Apprentice
    Join Date
    Mar 2010
    Location
    Maryville, TN
    Posts
    18

    Default 99MY 5.7L Vortec catalytic converters - expected life? Tell your story

    I have a 99 Suburban K1500 with 200k miles and I don't think the Catalytic converters have ever been changed. ( I have owned it for 90k miles )

    What kind of life can you get out of the factory CATs before the get plugged and don't flow correctly? I have what sounds like a exhaust back pressure sound coming from the drivers side when I rev the engine in the driveway while listening under the hood.

    Trying to track down a loss of power and what feels like a miss going up hill towing a load.

  2. #2

    Default

    Cut them off! My truck only had 200k kilometers and i cut mine off, and it felt like a new truck after i did! If you have strict emission laws, i suggest high flow cats.
    www.youtube.com/ippielb
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  3. #3
    Jr. Apprentice
    Join Date
    Jun 2010
    Location
    Augusta, GA (for now)
    Posts
    12

    Default

    Definatly get rid of them or change them. You can get high flow aftermarket ones if you need to for about $100 each.

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