GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 3 of 3
  1. #1
    Jr. Apprentice
    Join Date
    Mar 2010
    Maryville, TN

    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


    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.
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
    6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case
    EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection
    35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump
    AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake
    Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
    NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims
    Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light
    BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat
    Electric Fan Autometer Pressure, Boost, and Pyro Gauges
    4.56 Gears Airlift Air Bag Suspension

  3. #3
    Jr. Apprentice
    Join Date
    Jun 2010
    Augusta, GA (for now)


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

Similar Threads

  1. catalytic converter
    By kbhawaii in forum General Chevy & GM Tech Questions
    Replies: 3
    Last: 05-30-2010, 12:47 PM
  2. Removing Catalytic
    By AVives in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 7
    Last: 03-05-2010, 06:53 AM
  3. Catilytic Converters?....
    By ippielb in forum Performance & Fuel
    Replies: 21
    Last: 03-25-2009, 08:39 AM
  4. catalytic converter
    By cascott325 in forum General Chevy & GM Tech Questions
    Replies: 13
    Last: 12-17-2008, 08:08 AM
  5. 04 silverado catalytic converter
    By billjab in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 05-04-2008, 08:47 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts