436403
industrial injection

Industrial Injection LML Duramax CP4 to CP3 Conversion Kit with CP3 Pump (Tuning Required) - 11-16 GM 6.6L Duramax LML - 436403

Thoroughbred Sku #: IIS436403-CRE

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Product Details

Product Name: LML Duramax CP4 to CP3 Conversion Kit with CP3 Pump (Tuning Required)
Manufacturer: Industrial Injection
Manufacturer Part #: 436403
Thoroughbred Diesel Part #: IIS436403
Fitment Notes: 2011-2016 GM 6.6L Duramax LML

The Industrial Injection CP4 To CP3 Conversion Kit is a sure way to increase reliability and performance of the fuel system in your Duramax LML. Built as a drop-in replacement for your factory CP4, Industrial Injection designed this kit to work with all of your factory components. No need to spend even more on custom tuning, a programmer, or other modifications, because this kit works with factory components and will not cause any check engine lights.

Unlike other CP3 conversion kits on the market, the Industrial Injection has no start-ability issues. With this kit, there's no need to prime the injectors before starting the truck after installation of injectors. It's also emissions friendly! This CP3 Conversion Kit installs with all of the factory emissions equipment in place. There's no need to remove or "delete" any of the EGR or DPF systems on your truck. It will run as if it was from the factory.

Proven reliability! The factory installed CP4 has known failure issues that cannot be remedied. When these issues occur, they can cause damage to major components of your fuel system. The CP3 fuel pump has been proven to provide longevity and reliable performance.

Proven Reliability
The CP3 fuel pump is proven to have longevity and to be reliable in performance applications.

Remove the Worries
The CP4 has known failure issues that cannot be remedied. These issues, if they occur, can cause damage to other major fuel system components.

CP3 Pump Options:

  • Stock CP3
    Capable of 500+hp.
  • SHO 42% Over CP3
    Capable of 600+hp.
  • Dragon Fire 85% Over CP3
    Capable of 800+hp.
  • Double Dragon 120% Over CP3
    Capable of 900+hp.

- designed for competition use


Reviews

  • Your kit Industrial Injection LML Duramax CP4 to CP3 Conversion Kit with Pump Factory Fit - 11-16 GM DuramaxThoroughbred Sku #: IIS436401-CRESince that it requires no tuning, is this correct? Does it also work with the DEF system?

    Kevin | 12/7/2023

    Yes the  IIS436401 KIT WILL WORK WITH EMISSIONS and requires no tuning.

  • This says in the initial description (tuning required) and then in product details that it doesn’t need and tuning and works with all OEM parts. So do we need tuning or not?

    Nick Beissel | 11/26/2021

    Tuning is required on the kit you selected. They offer kits that do not require tuning.

  • HELLO I AM INTERESTED REPLACING THE CP4 TO A CP3 AFTER SEEING YOUR VIDEO I WILL NOT BE DOING THE WORK MYSLEF IM TO NEW TO THE DIESEL WORLD, WITH THAT SAID WILL YOUR CONVERSION KIT ALSO WORK WITH MY TRUCK WITH EGR AND DPF DELETE ON A H AND S TUNER? Thoroughbred Sku #: IIS436403-CRE PER THE ITEM IT STATES TUNE IS REQUIRED COULD YOU SPECIFY WHAT KIND OF TUNE I WOULD NEED ?

    CHRISTIAN | 4/30/2022

    Yes, https://www.thoroughbreddiesel.com/industrial-cp4-to-cp3-conversion-kit/, your tunes will have to be modified for the CP3. It has an LBZ FCA.

  • Does the kit with the factory fit pump require any tuning after installation or will it work with all factory settings?

    ty | 12/18/2021

    The kits on this page REQUIRE TUNING.