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  1. #1

    Default Catalytic converter!

    So i believe one of my cats if clogged, because my post 02 sensor is getting a low signal. I replaced the sensor twice and the engine light still comes on. So I'm looking to replace both cats. What are some top end cats that will improve the performance of my truck compared to the stock cats.
    2002 Gmc sierra
    5.3 v8 1500
    k&n air intake
    20inch liquidmetal dyno 6's
    xlerator dual exhaust.

  2. #2

    Default

    Magnaflow and Hedman both make good high-flow converters.
    ...
    ....

  3. #3

    Default

    i agree with miller...either one of them are your best bet

  4. #4

    Default

    If you're in a city that does not do emission testing it would be cool to take your cats out. If you get a tune with that you will get better gas mileage and more horse power.
    '07 Chevy Silverado Classic

    PERFORMANCE
    -K&N Intake
    -Air Raid Throttle Body Spacer
    -Thrush Muffler
    -Bully Dog Triple GT Programmer
    5.3L V8
    LOOKS
    -3" Spindle Lift
    -Tint
    -Blacked Out Rims
    -Blacked Out Taillights
    SOUND
    -2 Kicker CVT 12s
    -Rockford Fosgate 6.5"
    -500 Alpine Mono Block
    -Pioneer 6.5" Touch Screen
    -2 Boss Tweeters
    SOON!
    -3.73 gears

  5. #5
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    487

    Default

    If you replace them, don't throw them away! Salvage yards/recyclers are paying up to 100 dollars or more for them.
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

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