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    Kennedy Custom || Duramax LLY - Kennedy Custom


    Click on the Item Name for more detailed information.



    Item Information Purchase Options
    KD Custom ECM programming for Duramax LLY    

    Dual mode switchable tuning allows you to have your choice of two tunes available at all times! Tunes are typically set as a 50HP economy/tow and 80HP performance tunes. The economy tune has been producing very consistent mpg numbers at around 19-20mpg and sometimes more for single wheel trucks. DSP2 switch included with purchase. Higher HP and Race level tuning also available in listing below. A modified transmission is required for HP levels above 80RWHP.

    Installation Instructions and Product Review

    "This item requires your ECM be sent in OR exchange ECM can be provided." - JK

    Dyno Plot

    Race Dyno Plot

    When comparing dyno numbers, please note that my dyno plots do NOT use correction factors. These are no BS dyno runs with no inflation to make sales. -JK


    $695.00
    KD Custom ECM programming for Duramax LLY-Race level    

    Dual mode switchable tuning allows you to have your choice of two tunes available at all times! Tunes available to produce anywhere from 40HP economy to 200 RWHP. DSP2 switch included with purchase.

    "This item requires your ECM be sent in OR exchange ECM can be provided." - JK

    Dyno Plot

    Race Dyno Plot

    When comparing dyno numbers, please note that my dyno plots do NOT use correction factors. These are no BS dyno runs with no inflation to make sales. -JK


    $895.00
    ECM core for Kennedy Custom Dmax LLY-Deposit only    

    If you do plan to return your ECM core but need us to supply you with a loaner, please select this item. We can also program the ECM to any factory calibration if necessary. This item available for purchase ONLY with Kennedy Custom Tuning and is not available for individual outright sale. Core must be returned within 30 days or it will be billed as non refundable. Please note: If core deposit only is selected any future updates will require that the ECM be sent to us for the update.


    $800.00
    ECM core for Kennedy Custom Dmax LLY-Purchase    

    If you do not plan to return your ECM core please select this item. We can also program any ECM to your factory calibration if necessary. This item available for purchase ONLY with Kennedy Custom Tuning and is not available for individual outright sale.


    $800.00
    KD Basic ECM programming for Duramax LLY    

    Basic tune changes include passlock reset for engine swaps, speedo recalibration, factory updates, and fixing basic Diagnostic Trouble Code issues.

    "This is not a complete tune, only a basic fix and requires the ECM to be sent in to us or a suitable core must be provided. We will not provide a core for this item." -JK


    $200.00
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