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  1. #1
    Sr. Mechanic ChevyHD's Avatar
    Join Date
    Jan 2011
    Elberon, Iowa, United States

    Default Injectors/Headers

    I was just wondering if anyone had any luck with power/mpg gains with bigger fuel injectors or headers.
    2004.5 CCSB Duramax
    Max Effort Tuning by Idaho Rob - Goerend Transmission - PCV ReRoute - EGR Blocked - Plugged Resonator - 5" Diamond Eye Turbo Back - Tie Rod Sleeves - All On Mod - Edge Insight CTS - Recon Taillights, Cab Lights, & 3rd Brake Light

  2. #2


    Go with long tube headers, they will provide the most HP gain, with your set-up you could probably see around 10-15HP. I'm not sure but I know with some vehicles you don't need bigger injectors until you reach a certain HP level, like 500+. Bigger injectors make more fuel flow, right? So my thinking is that you might actually lose mpg because you are using more fuel. I believe performance mods can hurt mpgs because with the added power and/or sound, most of us like to press the pedal a little more to feel/hear the difference.
    Last edited by Metaluzc; 01-22-2011 at 09:13 AM.
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

  3. #3
    Sr. Mechanic ChevyHD's Avatar
    Join Date
    Jan 2011
    Elberon, Iowa, United States


    Alright thanks. And let me know how you tune from diablew works because I was looking into it and planned on having him make me one.

  4. #4


    I have to get my long-tubes on first so I can do a good log but will let ya know after that.

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