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  1. #1

    Default Aftermarket High flow cats/headers???

    I have the 08 with a 5.3, k and n intake, throttle body spacer, flowmaster cat back. I am thinking about headers and high flow cats...this is a big investment, would this be recommended? also there is a little over a year left on the warranty would this void it? thanks!

  2. #2

    Default

    Quote Originally Posted by blacksilverado14 View Post
    I have the 08 with a 5.3, k and n intake, throttle body spacer, flowmaster cat back. I am thinking about headers and high flow cats...this is a big investment, would this be recommended? also there is a little over a year left on the warranty would this void it? thanks!
    The Headers would help, but replacing the Factory Cats with Aftermarket High Flow Cats......would give you no Benefits, the Factory Cats on the Late Model Trucks Flow Much better than most think they Do.....save you money and invest in a Tune either Handheld or Custom.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

    Default

    X2 on what Mike said and drop the throttle body spacer.

    ________2013 4C Rated__________


  4. #4

    Default

    X2 on Heartbeat comment.
    I would check with you local service dept before making any changes to your truck, especially your engine/trans . They will let you know what their going to do with your warranty. I know legally they cant hold you at fault for aftermarket parts ( as long its not the cause of the warranty issue) but its rarely worth the legal battle.

    2009 Silverado 1500
    5.3L / 3.73 G80 / 4spd / 4x4 / LWB/ Ext Cab / HD Tow-Haul
    2.25in ReadyLift Level Kit / 3in blocks/ 3500lb HellWig / 265x65x17 Wrangler AT
    K&N Filter / AirRaid MIT / MagnaFlow 2.25" Dual Exhaust / HyperTech MaxEnergy

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