What Is a Duramax Full Delete Kit?
A Duramax full delete kit is the definitive answer to "What is deleting a truck?" for heavy-duty off-road and competition vehicles. The factory emissions setup on a 6.6L Duramax is a closely linked chain of restriction points. The EGR recirculates abrasive soot back into your cylinders, causing oil dilution, while the DPF chokes your exhaust velocity and forces fuel-wasting "active regeneration" cycles.
A complete Duramax emissions delete kit replaces these failure-prone sub-systems with high-flow hardware and specialised digital calibration. At EGR Performance, our kits are built with industrial-grade materials field-tested under extreme towing weights to guarantee zero-compromise structural reliability.
CAN Bus Plugs are dummy connectors, which are plugged into the factory harness (typically at the NOx sensor and DEF tank harness locations). They are able to provide a closed-loop signal to the ECM, which tricks the system into thinking the sensors are still present.
Our Core L5P/LML Complete Delete Kits Specifications
To simplify your physical overhaul, we have built vehicle-specific master bundles tailored for precise chassis fitment:
- L5P Master Package (2017-2019): Features our high-flow 4" DPF Delete Pipe & EGR Delete Kit w/downpipe & CAN Bus Plug for 2017-2019 6.6L Duramax L5P. This addresses the tightly pinched factory downpipe restriction in one shot.
- LML Protection Package (2011-2015): Features our heavy-duty 4" DPF Delete Pipe & EGR Cooler Delete Kit for 2011-2015 6.6L Duramax LML, providing the ultimate relief for mid-range torque limits.
- Late-Model L5P Package (2017-2022): Features our precision-engineered 4" DPF Delete Pipe & EGR Cooler Delete Kit for 2017-2022 6.6L Duramax L5P, designed to stop soot loading dead in its tracks.
Kit Components of an All-in-One Duramax Delete Kit
Our all-in-one LML complete delete kit and L5P full delete kit bundles pack everything required for a seamless physical conversion. Each package includes mandrel-bent DPF/CAT delete pipes (up to a massive 5-inch straight pipe duramax system for that deep V8 growl), precision laser-cut EGR block-off plates, and durable cooler bypass lines.
To safeguard your electronic network, we supply a custom L5P tuner harness plug kit and a weather-sealed L5P CAN bus plug loop connector. Tailored specifically for 2011+ LML and L5P platforms, these bundles eliminate exhaust bottlenecking from the turbocharger to the tailpipe at an affordable price, backed by our no-hassle return policy.
Benefits of an LML & L5P Full Delete Kit
Why choose an off-road tuned and deleted L5P Duramax rig? Expect raw gains of 50 to 150+ horsepower, reduced backpressure, and a drastic drop in Exhaust Gas Temperatures (EGTs) by up to 150°F. By eliminating active regeneration cycles, your fuel efficiency can climb by 2 to 5 MPG.
More importantly, it halts diesel fuel from washing past the piston rings, preventing active regeneration oil dilution and extending internal bearing life. This provides quicker throttle response and smoother gear transitions for 2018, 2024, 2025, and 2026 L5P upgrades.
Choosing a high-end LML tuner with delete capability or going the L5P delete and tune route allows you to fully customize your truck's power parameters.
Hardcore Technical Notes: 2024–2026 Global B & 10-Speed Realities
As a veteran voice in the heavy-duty diesel industry, our technical editors choose to address the complex electronic and mechanical realities that other shops hide:
The E42 ECM Bench Unlock Process (2024+ Models)
Running a l5p delete kit with tuner package on 2024, 2025, or 2026 trucks requires conquering GM's highly encrypted Global B electronic architecture. The factory E42 ECM cannot be flashed via the OBD2 port out of the box. Performing an l5p delete and tune requires removing the physical ECM and sending it in for a bench-unlock service (such as HP Tuners). Plan for a 3-to-5-day vehicle downtime while your computer is being physically unlocked.
The 10-Speed Allison (10L1000) Drone Factor
2020+ models cruise at exceptionally low RPMs (often between 1,100 and 1,300 RPM) thanks to the 10-speed Allison transmission. If you choose a 5-inch straight pipe upgrade, towing a heavy fifth-wheel at these low RPMs can cause extreme low-frequency interior cabin resonance ("drone"). If cab comfort is your priority, choose a full kit that includes a high-flow performance muffler to cancel drone while preserving EGT reduction.
TCM Locking & High-Horsepower Tuning
While l5p race tuning can easily unlock triple-digit power, the stock Allison 10-speed torque converter clutches are sensitive. If you run aggressive l5p tuning delete maps over 90 HP, we highly recommend an upgraded high-pressure valve body kit or a synchronized T93/T98 TCM unlock to step up line pressures and prevent clutch slip.
- DEF Tank Physical Disposal: Once an L5P tune and delete or an LML tune and delete file is loaded, the urea fluid injector stops firing. You can leave the massive fluid tank on the frame or unbolt it entirely. If left on the truck, drain the remaining diesel exhaust fluid immediately. Stagnant DEF will crystallize over time, and its corrosive residue can easily degrade surrounding chassis metal and brake lines if a leak occurs.
- Rusted Exhaust Temperature Sensors: When unbolting your stock LML exhaust, the temperature sensors are almost always seized in the pipe. If they snap off during removal, do not stress or buy replacements. Because your custom LML off-road tuning or L5P delete tuning programming completely ignores these sensor streams, you can leave them unplugged and seal the empty ports on your new high-flow pipe with standard zinc bolts.
LML & L5P Delete Kits Installation Tips
Performing a comprehensive LML full delete kit or L5P full delete swap takes 4 to 8 hours with basic shop tools.
The process requires a strict sequence: always flash your off-road L5P tuner and delete or LML emissions delete tuning maps to the truck first to verify ECM communication before physically unbolting a single pipe. This practice avoids unexpected computer calibration faults halfway through the mechanical teardown.
Duramax Full EGR, DPF, DEF Delete Kit Compatibility and Fitment
Our industry-certified kits provide absolute bolt-on accuracy for Chevy Silverado and GMC Sierra 2500HD/3500HD trucks. We cover every major LML and L5P platform generation, including:
- 2011–2014 LML Models: Highly targeted 2011 Duramax full delete kit, 2012 Duramax full delete kit, 2013 LML Duramax full delete kit, and 2014 Duramax full delete kit options. Perfect for executing an ML full EGR delete project.
- 2015–2016 LML Platform: Optimized 2015 Duramax full delete configurations, including our specialized 2015 Duramax full delete kit, 2015.5 Duramax full delete kit, and the final-year 2016 Duramax full delete kit or 2016 Duramax LML full delete kit. Ideal for completing a complete LML delete kit overhaul.
- 2017–2026+ L5P Platform: Specialized 2017 Duramax full delete kit, 2018 Duramax full delete kit, and advanced full delete kit for L5P Duramax bundles that fully support high-performance L5P tuner and delete setups.
Whether you need to tune and delete 2015 Duramax trucks or execute a complex tune and delete L5P build, trust EGR Performance for certified, track-proven quality, field-tested stability, and unbeatable customer success stories. Upgrade your rig today!
⚠️ Legal Disclaimer: All Duramax full delete kit packages, high-flow exhaust pipes, and EGR bypass plates sold by EGR Performance are designed, manufactured, and intended strictly for closed-course competition, off-road racing, or exhibition use only. They are not legal for use on public streets, highways, or within regions requiring mandatory state emissions inspections.
