Full DEF Delete Kit w/ Mini Maxx V2 Tuner | GM/Chevy Duramax LML 6.6L | 2011-2015

DEF Delete Kit for LML Duramax 2011-2015

The 2011, 2012, 2013, 2014, 2015 LML DEF delete kit is an All-in-One bundle designed for Chevrolet Silverado HD and GMC Sierra HD trucks equipped with the 6.6L Duramax LML diesel engine. The package combines the Mini Maxx V2 tuner with the exhaust and EGR hardware required to remove the restrictive factory DPF, DEF, and EGR emission systems for off-road and competition applications. It provides a complete matched solution rather than requiring the tuner, exhaust, EGR components, and installation hardware to be sourced separately.

Once the mechanical components are installed, the Mini Maxx V2 provides the required tuning so the ECU can operate correctly without the removed factory aftertreatment system. This eliminates normal DPF regeneration and DEF dosing associated with the removed hardware while allowing freer exhaust flow. Available power levels provide up to +150 HP, while the tuner also offers real-time engine monitoring. Actual performance, fuel economy, efficiency, and reliability depend on engine condition, tune level, supporting modifications, load, and driving style.

Why Choose This Kit

• Mini Maxx V2 Included - combines tuning and real-time engine monitoring in a compact in-cab device.
• Multiple Power Levels - choose between Stock, +50, +100, and +150 HP calibrations.
• Complete LML Solution - combines the tuner with DPF/DEF exhaust hardware and EGR components in one package.
• Optional Up-Pipe - select the additional up-pipe when required for the desired EGR configuration.
• Return to Stock - the tuner provides the ability to restore the original factory calibration when the proper stock file has been retained.

Vehicle Compatibility

This package fits supported 2011, 2012, 2013, 2014, and 2015 LML pickup models. It should not be used for earlier LMM engines, later L5P trucks, or other Duramax platforms.

Kit Components

• Mini Maxx V2 Tuner - provides the electronic tuning required to operate the LML engine after the factory emissions hardware is removed. Its built-in display can also monitor selected engine parameters in real time.
  • Preloaded Tuning - provides Stock, +50 HP, +100 HP, and +150 HP power options for different performance requirements. The tuner also supports returning the truck to the original calibration when the stock file is properly retained.
• DPF/DEF Delete Pipe or Exhaust Hardware - replaces the restrictive factory DPF/DEF aftertreatment section and creates a freer exhaust path. The exact exhaust configuration depends on the option selected on the product page.
• EGR Delete Kit - removes the applicable EGR valve and cooler components, preventing exhaust gas from being recirculated through the intake after the corresponding tuning is installed.
• Block-Off Components - seal the appropriate EGR connections after the factory EGR hardware has been removed.
• Optional Up-Pipe - available as an additional configuration for customers who want to replace the factory EGR-style up-pipe. Select “With Up-Pipe” to include it; the “None” option does not include this part.
• Clamps & Installation Hardware - includes the clamps, fasteners, fittings, and related hardware required to secure the supplied mechanical components.
• Tuner Cables & Connections - provide power and communication between the Mini Maxx V2 and the truck for programming and real-time monitoring.
• Installation Instructions - cover the basic tuner setup, mechanical installation, calibration loading, and post-installation checks.

Tuning & Performance

The LML DEF delete kit coordinates the mechanical removal of the DPF, DEF, and EGR systems with the electronic calibration required by the LML ECU. Removing the hardware alone would leave the factory controller expecting sensor data, DEF dosing, EGR flow, and DPF regeneration. The Mini Maxx V2 changes the relevant strategies so the engine can operate with the modified system.

Available Power Levels

The Mini Maxx V2 also functions as an in-cab monitor, allowing the driver to view important engine operating data rather than using the device only during flashing.

After a properly completed 2011-2015 LML DEF delete, possible changes include:

• Elimination of normal DPF regeneration cycles
• No DEF consumption for the removed system
• Freer exhaust flow
• Improved throttle response
• Up to +150 HP depending on the selected tune
• Real-time monitoring of engine parameters
• More direct power delivery

The higher horsepower settings place greater demand on the engine and drivetrain. A mechanically healthy truck is essential, and the appropriate power level should be selected according to load, use, and supporting modifications.

Fuel economy may improve under some operating conditions because regeneration cycles and exhaust restriction are eliminated, but no specific MPG increase can be guaranteed.

Installation

Installing the LML Duramax DEF delete kit involves exhaust work, EGR removal, optional up-pipe replacement, and electronic programming. Professional installation is recommended, especially when replacing the up-pipe, because access around the turbo and EGR system can make this portion of the job considerably more involved.

Typical tools include:

• Standard metric sockets and wrenches
• Ratchets and extensions
• Torque wrench
• Penetrating oil
• Exhaust removal tools
• Vehicle lift or heavy-duty jack stands
• Basic electrical tools
• Stable battery charger
• Appropriate safety equipment

The typical installation sequence is:

1. Connect the Mini Maxx V2 and follow the tuner setup procedure.
2. Save the required factory information before programming.
3. Remove the factory DPF/DEF exhaust section.
4. Install the selected delete pipe or exhaust hardware.
5. Remove the applicable EGR valve and cooler components.
6. Install the block-off hardware.
7. Replace the up-pipe if that option was selected.
8. Load the appropriate Mini Maxx V2 calibration.
9. Start the engine and verify proper operation and monitoring.

Installation time depends heavily on corrosion, vehicle condition, and whether the optional up-pipe is being replaced. The up-pipe configuration generally requires more labor than the basic exhaust and EGR installation.

Ordering Information

Before ordering, confirm the model year, 6.6L LML engine, pickup configuration, and any existing engine or exhaust modifications. Then select whether the package should include the optional up-pipe.

The Mini Maxx V2 and tuning-related components generally require approximately 3–4 business days for processing. Delete pipes and exhaust components typically ship within approximately 5–6 business days, while EGR hardware generally requires around 5 business days. Different components may arrive in separate shipments.

Technical support is available Monday through Friday, 9:00 AM–4:00 PM PST for questions about product selection, Mini Maxx V2 setup, tuning, and installation.

Custom-configured electronics, programmed devices, and other customer-specific products may become non-returnable after processing or programming has started. Eligible unused hardware requires prior return authorization and must meet the applicable return conditions.

This full upgrade is intended only for lawful off-road, racing, or competition applications. The customer is responsible for complying with applicable emissions regulations.