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  1. #1
    Jr. Apprentice BlackedOut010's Avatar
    Join Date
    Apr 2011
    Winston-Salem, NC

    Default Flowmaster 40 series

    Wasnt quite sure what category to put this in but figured id get the most feedback here. I drive a 2010 Silverado 5.3L. Im looking at ordering a flowmaster 40 series muffler but not quite sure what size inlet i need to order. Any help here?

    Not a lot done so far, havent had the thing long...
    18% tint to match factory rear
    color matched bowties
    Rough Country leveling kit (not shown in picture)
    removed front valence
    8000k HIDs

    Near future mods....
    Grillcraft MX series mesh grille
    KMC Hoss wheels
    Terra Grapplers.....

  2. #2


    Probably ought to climb under the truck and take a few measurements.....
    When you hear hoofbeats, look for horses not zebras.

  3. #3


    Your more than likely looking at a 2.5" inlet and outlet. I would just take the truck to a local muffler shop and have them get the size for it.

  4. #4


    Flowmasters website recommends part # 953047. Its a 40 series with 3" inlet/outlet.

  5. #5


    is the exhaust currently on it stock?

  6. #6
    Jr. Apprentice
    Join Date
    Mar 2011
    Watertown, Wisconsin, United States


    buddy of mine has and 08 and he had 3" in and 2 3/4" out fit was perfect.

    sierra 1500
    flex 5.3l
    custom coldair intake
    magnaflow muffler
    leveling kit(keys and add-a-leafs)
    H.I.D 10000k head lights

  7. #7
    Jr. Apprentice Adam's Avatar
    Join Date
    Mar 2011
    Blog Entries


    You should have 2.5 inch stock exhaust and would need the inlet to accomodate that. I would recommend welding the muffler versus clamps. Thats just my personal opinion from my experience. If you are planning to have duals make sure that you get the muffler that has dual exits. You will like the new sound. I have the 40 series flowmasters on mine and it sounds nasty! I went with the true duals though. Good Luck

    2006 Silverado 2500HD Duramax LBZ (NEW PROJECT)
    LineX, Mickey Thompson 16x8, 285/75R16 Yoko A/T, Tinted (Diesel Addiction EFI Tuning, and MBRP 5" next on the list)

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