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  1. #1

    Default 2010 Silverado Flex Fuel Muffler Suggestions.....?????

    I want a nice low rumble to my truck, not high pitched. I was told that the flex fuel trucks didn't sound good with a flowmaster muffler. Any suggestions?

  2. #2
    Jr. Apprentice rutroe's Avatar
    Join Date
    Oct 2010
    Schertz, Tx


    It's not the's the active fuel management that makes it sound weird. I had Flowmasters on mine before I switched to Magnaflow. It sounded alright. It didn't sound good when in V-4 mode and I don't think anything will fix that except turning AFM off.
    07 Silverado Z71, 6.0L, Turbonetics T-76 @ 10 psi, 75-shot, Comp 212/216 .560, 4L80, Yank 3000, meth injection, Magnaflow dumped, e-cutout, Nelson tuned

    Best time: 12.99@112

  3. #3


    Try a Dynomax #17233 Ultra Flo Welded muffler. 3" inlet and outlet. 20" body length. Stainless steel. Rumbly. Handles that 4-cylinder drone just fine.
    The Cheap-*ss Modder & Thread Killer
    The Realist says, "The glass is too big".

    2013 GMC Sierra 1500 SLT Z60 4WD Crew Cab
    Mineral Green Metallic w/ Tan Leather Interior
    5.3 L FLEX w/AFM, 6A, Cheap-*ss Mods
    32 Dump Club Member
    Range V8 AFM Eliminator

  4. #4
    Sr. Mechanic 00chevy53's Avatar
    Join Date
    Apr 2010
    sebastian, florida


    screw it just run cats only... with the right tip it takes away the raspy noise that you get from running it with out a muffler the only time it gets anoying loud is when you put your foot to the floor, but if you take it easy it sounds like its got a muffler
    2000 single cab short bed 1500 w/ 6.0 vortec maxx swap from a 2006 2500, custom intake, slotted brakes, shorty headers, 8mm wires, electric fan, strait piped, 4.5 inch lift, asp pulleys, true dual through body exhaust, built trans w/ shift kit, custom tune by efi alchemy...320rwhp

  5. #5
    Sr. Apprentice
    Join Date
    Oct 2010
    Panama City Beach, FL.


    Check out this thread...
    It's a nice set up and you can also hear it on youtube. Perhaps you could PM the one who started the thread and ask them your questions. Hope this helps... I am looking to have a new exhaust system added in the near future, just have to get some headers first... Show us some pics!!!!!!
    GO GATORS!!!
    2010 Chevy Silverado LT 4x4 Z71 Crew Cab
    5.3 L Vortec V-8
    Skid Plates
    Bluetooth, Steering Wheel Controls, Adjustable Pedals, all the goodies...:happy:
    Everything stock...

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