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1 14

GM Duramax LML 6.6L All-in-One DPF/DEF/EGR LML Delete Kit (2011-2016)

Sku: D6611-BundleA

This product fits:

2011-2015 GM Duramax 6.6L Chevy Silverado 2500 / 3500
$1,526.92
$1,375.60
-10%
Shipping calculated at checkout.
Choose Your Year: 2011-2015
Exhaust Quality: 409 Stainless Steel information icon

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Notification for the incorrect product/variant will be listed here.

Click here to find the right tuner for your truck!
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🚨 REMEMBER 🚨

Within the device vehicle info section, look for the value with the text containing "14C204":
HC3A-14C204-ABH

Once you receive the device, please contact us with your serial number, VIN, and ECU strategy so we can create the custom tunes and send it to you for tuning your vehicle.

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Please note: All sales of exhaust pipes, straight pipes, and engine pipes are final and Non-Returnable and Non-Refundable

Black Bandit Series 3 material image
T304 Stainless Steel

The Purest Stainless Steel used in Exhaust System Manufacturing

rust resistant icon

High Rust Resistance

Lasts up to 20+ years icon

Lasts Up To 20+ years

Looks better icon

Looks Better

Black Bandit title material-image
T409 Stainless Steel

The Standard Stainless Steel used in Exhaust System Manufacturing

rust prone icon

Low Rust Resistance

Lasts up to 20+ years icon

Lasts Up To 5-8 Years

Looks better icon

Looks Dull

Attention

A 2022 Cummins Tune Package was added to your cart. This tune is a beta tune that may cause the following:

  • Low power
  • Poor fuel mileage
  • Engine codes that may appear
  • Poor shifting characteristics

For a tested and proven tune, please view our Ram Cummins 6.7L All-in-One DPF/DEF/EGR Delete Kit w/ECM Swap (2022-2024)

Attention

You have added a product to your cart that requires the Service. This required additional service is NOT included in the price shown on TunerDepot.com. This means that you will be required to pay for the Service in addition to the product you have just added to the cart.

Overview

The GM Duramax 6.6L LML delete kit is engineered for 2011–2016 trucks that see real work, towing, and sustained load. This complete LML delete kit replaces the restrictive factory emissions hardware with a 4-inch DPF-delete race pipe, full EGR valve and cooler delete system and a pre-configured Mini Maxx tuner built specifically for deleted LML applications. By reducing backpressure and excess exhaust heat, this LML delete kit is designed to lower EGTs, improve turbo response and deliver more stable power and drivability when properly installed and calibrated.

Compatibility

Year Range Make Model Engine Body Style
2011–2015 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML Pickup
2015.5–2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML Pickup
2011–2015 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML Pickup
2015.5–2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML Pickup

Technical Specifications

Specification Detail
Exhaust Diameter 4.0 inch
Exhaust Material Mandrel-bent stainless steel
Flange Options V-band (2011–Early 2015) or 3-bolt (Late 2015–2016)
Tuning Device Mini Maxx delete tuner with pre-loaded off-road calibrations
EGR Delete Components Aluminum intake block-off plate, CNC-machined steel block-off plate, silicone coolant bypass hose
Application Type Off-road and competition use only

What’s Included in the LML Delete Kit

Item 2011–Early 2015 (V-band) Late 2015–2016 (3-bolt)
Delete Tuning Device Mini Maxx tuner included (pre-loaded delete calibrations) Mini Maxx tuner included (pre-loaded delete calibrations)
DPF-Delete Race Pipe 4-inch stainless steel race pipe – V-band configuration 4-inch stainless steel race pipe – 3-bolt configuration
EGR Valve Delete Kit Included Included
EGR Cooler Delete Components Included Included
Coolant Bypass Hose Included (reinforced silicone) Included (reinforced silicone)
Block-Off Plates Aluminum intake plate and CNC-machined steel EGR plate Aluminum intake plate and CNC-machined steel EGR plate
Hardware and Seals Complete hardware, clamps, and gaskets included Complete hardware, clamps, and gaskets included


Included Duramax LML EGR Delete Kit Components

Item Quantity / Description
Aluminum Intake Block-Off Plate 1 × Plate with integrated O-ring seals
Steel EGR Block-Off Plate 1 × CNC-machined steel plate
Silicone Coolant Bypass Hose 1 × Reinforced silicone hose with pre-crimped fittings
Hose Clamps 4 × High-pressure clamps
Socket Head Bolts 4 × Socket head fasteners
Hex Head Bolts 5 × Hex head fasteners

Important Variant Selection Notice

This LML delete kit is offered in two variants based on factory turbo outlet flange design. Selecting the correct version is mandatory for proper fitment:

  • 2011–Early 2015 – Uses a V-band clamp at the turbo outlet.
  • Late 2015–2016 – Uses a 3-bolt turbo outlet flange.

Due to production overlap, VIN decoding may be inaccurate. Flange type must be confirmed by visual inspection at the turbo outlet before ordering.

Key Features & Build Details

  • 4" Stainless Steel DPF-Delete Race Pipe – Mandrel-bent construction minimizes exhaust restriction and heat retention compared to the factory emissions-equipped exhaust.
  • Complete EGR Valve & Cooler Delete System – Includes precision-machined block-off plates and reinforced silicone coolant bypass hose to fully remove failure-prone EGR components.
  • Flange-Specific Exhaust Design – Available in V-band or 3-bolt configurations to match production-year turbo outlet connections.
  • Mini Maxx Tuner Included – Supplied with off-road performance calibrations designed specifically for deleted LML applications.
  • Full Hardware & Gasket Kit – All required fasteners, clamps, and sealing components included for a complete installation.

Performance Benefits

  • Reduced Exhaust Gas Temperatures – Improved exhaust flow lowers EGTs during towing and sustained load conditions.
  • Improved Turbo Response – Lower backpressure supports quicker turbo spool and stronger mid-range torque.
  • Enhanced Power Potential – Optimized airflow provides a solid foundation for performance-oriented tuning.
  • Lower Thermal Stress – Eliminates soot accumulation and heat buildup associated with factory emissions systems.
  • Calibration-Driven Efficiency – Fuel and timing strategies are optimized through included tuning.

Installation Notes

Installation is rated as moderate difficulty and professional installation is recommended. The vehicle must be tuned using the included Mini Maxx device before removing any emissions hardware to prevent diagnostic issues. Factory exhaust removal may require cutting, and flange type must be visually verified at the turbo outlet prior to ordering.

Frequently Asked Questions

Q: How do I identify whether my truck uses a V-band or 3-bolt flange?
A: Inspect the downpipe connection at the turbocharger. A circular clamp indicates a V-band flange, while a triangular flange with three fasteners indicates a 3-bolt configuration.

Q: Does this kit fit Cab and Chassis trucks?
A: No. Cab and Chassis models use different exhaust routing and mounting locations and are not compatible.

Q: What is the difference between 2015 and 2015.5 LML trucks?
A: 2015 is a split production year. Early-2015 trucks use a V-band flange, while 2015.5–2016 trucks use a 3-bolt flange. Because of production overlap, visual inspection is required.

Q: Can I add a muffler to this system?
A: Yes. A 4-inch inlet/outlet muffler can be installed for sound control without affecting tuning requirements.

Q: is this Duramax LML EGR Delete Kit?
A:  This is not just a Duramax LML EGR delete kit.

This product is an all-in-one package that includes:

    • Tuner
    • Preloaded tuning
    • EGR delete components
    • Required pipes

If you are only looking for Duramax LML EGR delete parts (such as EGR block-off plates for an EGR-only delete), those items are sold separately.

Please Note:

The vehicle must be tuned without codes prior to any emissions system removal or modifications. Failure to follow instructions may cause damage to the ECM or void warranty coverage.

Important Product Information

Off-Road Use Only: The products sold on this website are intended for off-road use only, and may not be legal for use on public highways where pollution control laws apply.

Check Local Laws: Before purchasing and installing any of these parts, please check your local and state laws to confirm whether the modifications are legal in your area.

Professional Installation Recommended: These kits and parts are strongly recommended to be installed by professional mechanics only. Improper installation may lead to performance issues or damage to your vehicle. Unless specified differently on the product page, our parts do not include installation instructions. They are intended for individuals with a proficient understanding of mechanical systems and procedures. Like many aftermarket parts compatible with a variety of vehicles, minor adjustments or modifications may be necessary during the installation process. We cannot accept returns or offer refunds on the basis of an inability to complete the installation due to the absence of instructions.

Warranty: The use of these parts will void the warranty of your vehicle. Please confirm with your vehicle manufacturer before purchase and installation.

No Liability: Tuner Depot is not responsible for any damage or issues that may arise from the use of these parts.

Product Images: Product images are for illustrative purposes only and may differ from the actual product due to manufacturer design changes or improvements.

No Performance Guarantees: While these parts are designed to enhance the performance of your vehicle, no guarantees are made regarding the specific performance gains that will be achieved.

Shipping Policy at Tuner Depot

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Our Shipping Policy: Our aim is to dispatch all orders within two business days, providing you with a quick and efficient processing time. However, unforeseen circumstances beyond our control may occasionally impact shipping times.
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