What Is an LML Duramax EGR Delete Kit?
An LML Duramax EGR delete kit is a performance upgrade designed specifically for the 2011–2016 GM 6.6L LML Duramax diesel engine. This kit removes or bypasses the factory Exhaust Gas Recirculation (EGR) system, which is installed on many GM diesel trucks to help reduce emissions.
What's Included in an LML Duramax EGR Delete Kit?
An LML Duramax EGR delete kit includes the essential components required to remove or bypass the factory EGR system on 2011–2016 GM 6.6L LML Duramax diesel engines. Most kits typically include:
- EGR Block-Off Plates
- Coolant Bypass or Reroute Hose
- Intake Elbow or Intake Bridge
- Gaskets and O-Rings
- Mounting Hardware
- EGR valve cooler delete kit components
Key Benefits of Installing a LML Duramax EGR Delete Kit
- Reliability: Eliminate the EGR cooler to prevent coolant leaks and head gasket failure.
- Engine Longevity: Stop soot recirculation to keep your oil clean and intake clear.
- Lower Maintenance: End expensive EGR valve cleanings and repetitive cooler repairs.
- Better Cooling: Reduce engine temperatures by removing the restrictive EGR system.
- Performance: Experience smoother power delivery and improved throttle response.
LML Duramax EGR Delete Kit: Deleted vs. Stock
| Dimension | Stock | Deleted |
| Horsepower | Limited by restrictive emissions and factory tuning; ~397 HP. | With tuning and airflow mods, gains of 60–150+ HP are common. |
| Fuel Economy | Efficiency is lost to frequent active regen cycles. | Removing intake and exhaust restrictions typically gains 2–4 MPG. |
| Maintenance Cost | Frequent DEF refills and expensive EGR/DPF sensor repairs. | Eliminates the complex components most prone to failure. |
| Reliability | EGR cooler leaks and limp mode errors are common. | Removes the primary cause of intake soot buildup. |
| Exhaust Gas Temp | Recirculated exhaust gases significantly heat the intake air. | Engine breathes cooler air, protecting the turbo and pistons. |
| Legal Status | Street Legal; EPA and CARB compliant. | Off-Road / Competition Use Only. |
LML Duramax EGR Delete Kit Model Year Fitment Guide
Choose the perfect Duramax EGR delete kit by year to guarantee seamless fitment and performance for your CHEVY HD truck.
| Engine & Model Year | Compatible Vehicles | Factory Emissions Equipped | Common Issues With Stock EGR System | Recommended EGR Delete Setup |
| LML Duramax (2011–2016) | CHEVROLET Silverado & GMC Sierra 2500HD / 3500HD | EGR + DPF + DEF (SCR) | Extreme carbon buildup in complex cooler, coolant leaks, sensor-related Limp Mode. | Stage 2 Delete Kit with Coolant Bypass & High-Flow Y-Bridge. |
How to Install an LML Duramax EGR Delete Kit
Installing an LML Duramax EGR delete kit involves removing the factory EGR valve and EGR cooler assembly and replacing them with block-off plates, coolant reroute components, and intake upgrades included in the delete kit.
Installation Steps
- Vehicle Preparation: The truck should be parked on a stable, level surface and the engine allowed to cool completely before beginning the installation. Both batteries are disconnected to prevent electrical issues during the process. Because the factory EGR cooler is connected to the engine’s cooling system, a portion of the coolant is usually drained prior to removal. Intake tubing, engine covers, and nearby components may be removed to provide clear access to the EGR assembly.
- Remove Factory EGR Components: The factory EGR valve, EGR cooler, and connecting pipes are carefully unbolted and removed from the engine. During this step, coolant lines, electrical connectors, and mounting hardware are disconnected. After the EGR components are removed, the mounting surfaces on the intake and exhaust areas are cleaned to ensure proper sealing when installing the new delete components.
- Install Delete Kit Components: Next, the components included in the LML Duramax EGR delete kit are installed. Block-off plates are positioned to seal the original EGR ports, preventing exhaust gases from entering the intake system. If the kit includes an upgraded intake elbow or intake bridge, it replaces the factory intake connection and helps improve airflow into the engine. All components are secured using the supplied gaskets and mounting hardware.
- Coolant System Reroute: Since the EGR cooler is removed, the coolant system must be rerouted using the coolant bypass hose or fittings included in the kit. This step ensures proper coolant circulation through the engine while eliminating the factory EGR cooler from the cooling system.
- Reassemble Engine Components: Once the delete components are installed, the intake tubing and any removed components are reinstalled. The cooling system is then refilled with fresh coolant, and air may be bled from the system to maintain proper engine operating temperatures.
- Final Check and Verification: Before operating the vehicle, all hardware, hose connections, and sealing surfaces should be inspected to ensure proper installation. The batteries are reconnected, and the engine is started to confirm normal operation. During the warm-up process, coolant lines, block-off plates, and other connections are checked to ensure there are no leaks.
Note: Every EngineGo kit includes a comprehensive, model-specific guide to ensure your installation is seamless and your fitment is guaranteed. For technical deep-dives, step-by-step photos, and specific torque specs, you can find detailed information under the "Installation Guide" tab on every product page.
Why Choose EngineGo for LML Duramax EGR Delete Kit
Choosing EngineGo means partnering with diesel performance experts. We back every build with technical support, ensuring your truck moves from the shop to the street with peak power and reliability.
15+ Years of Expert Support
In-House Specialists: Our team has over 15 years of hands-on experience in Ford Powerstroke, Cummins, and Duramax platforms.
Expert Guidance: We provide comprehensive support, from initial fitment questions to final tuning advice.
High-Performance Reliability
Built to Last: We pride ourselves on offering parts designed for maximum durability and long-term reliability.
Expertly Vetted: Every product is backed by our deep understanding of diesel engines.
A Seamless Shopping Experience
Free Shipping: Many of our kits include free shipping to get your project started without extra costs.
Money-Back Guarantee: Shop with confidence knowing your purchase is protected if you aren't satisfied.
Off-Road Use Disclaimer
Diesel delete kits are intended for off-road and competition-use vehicles only. These products are not legal for use on public roads and are sold strictly for non-emissions-controlled applications.
Always verify and comply with local, state, and federal regulations before purchase or installation.
FAQ
What vehicles use the LML Duramax engine?
The LML Duramax engine was used in 2011-2016 GM heavy-duty diesel trucks, including:
- Chevrolet Silverado 2500HD / 3500HD
- GMC Sierra 2500HD / 3500HD
What does an LML Duramax EGR delete kit remove?
Most kits are designed to address the factory EGR valve, EGR valve cooler, associated coolant routing, and intake / exhaust passages using block-off plates, bypass hardware, and intake upgrades.
Can an LML EGR delete kit improve horsepower?
Yes, in many off-road applications it can support improved horsepower, better throttle response, and smoother power delivery, especially when paired with a tuner, intake upgrade, and other airflow modifications.
Do I need a DPF delete or tuner with an LML EGR delete kit?
Many performance-oriented LML Duramax builds pair an EGR delete with a dpf delete and proper tuner support for best results. Exact requirements depend on your build configuration and intended use.
