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

Discussion in 'GM Powertrain' started by triple-4x4, Jun 6, 2010.

  1. triple-4x4

    triple-4x4 New Member

    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. ippielb

    ippielb Epic Member 5+ Years ROTM Winner 1000 Posts

    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.
  3. robb_03

    robb_03 New Member

    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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