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  1. #1

    Default GM Exaust '08 Silverado

    I am new to this site and new to this whole truck world. I am thinking of getting an exaust very soon and i am eyeing the GM OEM dual cat back system. Who has this and what do you think? I am thinking about the Cold Air intake through GM also. I have the 5.3L V8 08 Silverado.

  2. #2


    I have the same truck that I just bought. How much is the cold air intake? I have had several trucks and have always had great results with Flowmaster but that is me. The question I have is can I run true duels? Or do I have to run a single muffler.

  3. #3


    GM does have a dual system for this truck. I kind of want to go OEM to not void my warranty.

  4. #4


    The only warranty it will affect is on the exhaust. If you put aftermarket exhaust on it will not void ur entire warranty. I promise I have owned several trucks and I also did it to my wifes Mustang brand new. All they said when I took it for service was that they will not cover exhaust anymore.

  5. #5


    Oh well that may change the way i look at which exaust to get now

  6. #6


    Get what u want I am positive it will not void ur warranty.

  7. #7


    Quote Originally Posted by smithbuilt24 View Post
    Get what u want I am positive it will not void ur warranty.
    As discussed in other threads, the 2008s are sensitive to changes. If your exhaust mods make codes start popping, then there's a pretty good chance a dealer could void your warranty. SilverStud is wise, but poorer, to go with the GM option. I don't have any experience with the factory cat back; but, many (myself included) find the Flowmasters too loud. To those of you in this camp, I just added a 4" resonator tip and it helps a little.
    Are we having fun, yet?

  8. #8
    Jr. Mechanic jmonte3's Avatar
    Join Date
    Jul 2008
    Lafayette, La


    I have flowmaster dual catback exhaust on my 07 5.3L NBS sierra and i think it sounds good...also gave me lil better mpg and hp

    07 Sierra NBS Black Crew Cab 5.3L Z71
    15% tint
    Gmc pin stripes
    Blacked out GMC Logos
    Dual Flowmaster exhaust
    Kicker Stereo System w/ Pioneer Avic-D3 Navi/Dvd
    Volant CIA
    Edge Evolution
    Poweraid TBS
    Leveling Kit
    Changed Door Handles to match shiney black paint

  9. #9


    we need a definative answer guys!!!

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