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  1. #11
    Jr. Apprentice BlackedOut010's Avatar
    Join Date
    Apr 2011
    Winston-Salem, NC


    Not quite sure what exactly and AFM is....i dont have a tuner and wasnt aware you needed one in order to do a simple upgrade as and exhaust....haha, but id surely like to know what im dealing with before i dive in....

    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. #12


    The AFM sensor is before the cats. If you're doing a catback system you don't need to touch the sensor. If you're replacing before the cats it's a whole different story. X2 what silveradotrailblazer said, stock is a single 3" pipe.
    2009 GMC Sierra 5.3L running on E85
    Black and chrome
    Volant CAI
    Borla dual exhaust
    Chrome Billet grill
    Tonneau cover
    4300k High/Low Beam HIDs
    Westin Ultimate Bull Bar with PIAA 540s
    Blacked-out tail and third brake light

  3. #13
    Jr. Mechanic drillbit26's Avatar
    Join Date
    May 2009
    Floyd, Virginia, United States


    I was under the impression if you did anything to exhaust other than stock you end up with a helicopter noise. Im not meaning to take over this thread
    2006 Silverado 2500HD, 6.0 Vortec, rhino spray in bed liner, LT package, westin step bars,true dual exhaust
    Mods to come: dixie horn, blacked out bowtie, recon smoked cab lights, recon led brake bar.
    Thank you lord:sign0011:

  4. #14


    I have also heard that with the new trucks when the engine goes to down to 4 cylinders there is a ping sound that comes from the exhaust. And I was told the solution for that was to get a tuner like a Diablo Predetor to stop shutting off the cylinders. If this is incorrect can someone set me straight.

  5. #15


    I have never heard of a ping sound when i had dualled straights and also with my new true dual flowmaster 40 series with 3 1/2 by 18 inch gloss black exhaust tips. Sometimes it seem's like it get's louder when the 4 cylinders kick in but it's just a deeper tone but not really noticable at all. I will be installing a magnaflow x pipe soon to give me a lil bit more hp and low end torque and can get one for about 75$ so not bad at all for a true x pipe. I can tell a good difference with the Flowmaster 40 series dual muffler along with tip's and k&N air filter and will update to let everyone know what difference i feel from the x pipe i will order it sometime this week and have installed by end of week. The next mod's will be a Hypertech power programmar and high flow cat's soon to follow some long tube header's and might upgrade to a cold air intake but from what i heard it's not really worth the money just make's the air flow louder...

    2008 Chevy Silverado Ext. Cab Lt Z71 5.3 V8
    7.5 Inch Rough Country Suspension Lift
    RBP Replica Grille Black w Chrome Rivets
    Recon Smoked Cab Roof Lights
    N-Fab Powdercoated Gloss black Cab Length Nerf Steps
    5% Tint over 20% all the way around / 5% Eyebrow Strip
    AVS Smoked Window Visors
    Z71 Stickers Black & Metallic Silver
    Tow Mirrors / Smoked Turn Signals
    XM Satellite Radio Fin / Color Matched
    Interior Plastic Pieces / Color Matched
    Power Acoustic Tweeters
    Painted Bowties / Color Matched
    Painted Door Handles / Color Matched
    Smittybilt Bull Bar / Color Matched
    Custom Rolled Edge Exhaust Tips / Color Matched
    Custom 2.5 Inch Cat Back True Dual Exhaust
    Flowmaster Super 40 Series Dual in / Dual out
    Magnaflow Tru-X Pipe
    K&N Air Filter
    18x9 Rockstars Machined Black
    Center Caps / Color Matched
    33.13.50 Nitto Terra Grapplers
    New Front Wheel Well Liners
    Eagle Eye Black L.E.D. Tailights
    Eagle Eye Black L.E.D. Third Brake Light / Smoked
    Eagle Eye Black L.E.D. Halo Projector Headlights
    Notto HID Kit 10,000k Low beams
    Recon L.E.D. Light Bar
    Buschwacker OE Style Tailgate Cap
    AMI Gloss Black Antenna
    Debadged Chrome Lettering
    Door Molding Removed

  6. #16


    I had a 40 put on my 08 sierra, and when it went into 4 banger mode it, reminded me of the pod racers from STAR WARS episode one The Phantom Menace. It was just fine. ALOT of people gripe about this sound, it is kinda love it/hate it i guess.....Good Luck.
    Electric No Front Shaft
    2010 Chevrolet Silverado Hybrid 2wd | White CrewCab | Kenwood DNX-8120 | Backup Camera | XM | Infinity/Pioneer/Profile |

  7. #17


    Ha yeah somethin must be wrong i guess idk i have never heard this sound lol that's kinda funny they hear that but hopefully i don't havent since i installed it.

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