LML Duramax Full Delete Kit

Why Does Your LML Duramax Need a Full Delete Kit?

The 2011-2016 LML is the first Duramax saddled with a full EGR, DPF and DEF stack at once, and that triple emissions load is exactly what drives these trucks into the shop. Three failure modes repeat on every high-mileage LML we see.

Soot Saturation in the Intake Tract

Routed exhaust gas dumps carbon back through the intake elbow and cylinder head. Over tens of thousands of miles that soot cakes the intake runners, chokes airflow and starves the cylinders, which shows up as sluggish throttle, smoke and lost boost response. A full delete kit shuts off that recirculated soot at the source so the intake stays clean.

Thermal Fatigue and EGR Cooler Cracking

The LML EGR cooler lives in sustained 1,400-degree exhaust heat, and thermal cycling fatigues the core until it cracks. A cracked cooler pushes coolant into the intake, drops coolant level and can hydro-lock the engine. Deleting the cooler removes the most common catastrophic LML failure outright.

Stuck EGR Valves and Limp-Mode Codes

Carbon builds up on the EGR valve pintle until it sticks open or throws a position code, triggering check-engine lights, DEF derate and limp mode. Block-off plates in the full delete kit lock the valve closed and remove the code path so the ECM runs clean.

What Can a Full Delete Kit Solve?

Each component in the LML full delete kit maps to a specific OEM weakness, and the kit removes them as a matched system rather than one-off patches.

EGR Cooler and Valve Removal

Billet aluminum block-off plates cap the EGR cooler feed and return ports on the cylinder head, and the up-pipe replaces the EGR feed fitting with a straight, high-flow T304 stainless section. The result is no more coolant in the intake, no stuck valve, lower soot and cooler combustion.

DPF and DOC Delete Pipe

The 4-inch mandrel-bent T304 stainless delete pipe replaces the clogged DPF and DOC canisters, restoring full exhaust flow, eliminating regen cycles and stopping the raw fuel that dilutes the oil during regen.

DEF System Disable

Paired with a delete tune, the DEF doser, NOx sensors and tank heater stop commanding the SCR, ending DEF derate, bad-fluid codes and limp mode on long tows.

High-Flow Intake Elbow

The CNC-machined high-flow intake elbow replaces the restrictive EGR-crossover elbow, smoothing airflow into the cylinder head and supporting the extra boost that comes with a tow or performance tune.

Shop Full Delete Kit by Chevy & GMC Engine & Fitment Guide

• EGR Delete Kit & Up-pipe for 2011-2016 6.6L Duramax LML - Fits the 6.6L Duramax LML in Chevy Silverado & GMC Sierra 2500/3500 HD (2011-2016). Replaces the EGR feed fitting and up-pipe with T304 stainless and seals the cooler ports with CNC billet plates.
• EGR Delete & High Flow Intake Elbow for 2011-2015 6.6L Duramax LML - Fits the 6.6L Duramax LML in Chevy Silverado & GMC Sierra 2500/3500 HD (2011-2015, early LML generation). Caps the EGR system and adds a CNC high-flow intake elbow for cleaner airflow into the cylinder head.
• 4" DPF Delete Pipe & EGR Cooler Delete Combo for 2011-2015 6.6L Duramax LML - Fits the 6.6L Duramax LML in Chevy Silverado & GMC Sierra 2500/3500 HD (2011-2015). Combines a 4-inch T304 stainless DPF delete pipe with billet EGR cooler block-offs for a complete EGR-plus-DPF delete.

For 2015.5 and 2016 LML trucks, confirm the up-pipe and intake elbow casting before ordering, since GM rolled running changes into the late LML generation. Our 24/7 support will match your VIN to the right kit.

Why Choose EGR Performance?

The industry standard for high-performance diesel reliability.

Premium Quality & Rigorous Testing

Our EGR, DPF, and CCV delete kits are engineered from premium-grade materials and subjected to brutal quality control and field testing. Unlike generic alternatives, our products are built to withstand extreme heat and pressure, delivering unmatched durability and long-term stability when your rig needs it most.

20 Years of Proven Diesel Expertise

We aren't just selling parts. We live in this industry. With two decades of hands-on experience providing specialized modification solutions for heavy-duty truck owners, our upgrades have been extensively proven across every driving environment, from daily towing to high-performance tracks.

Industry-Leading Standards

We work hand-in-hand with top-tier industry partners and reputable organizations. Every product we design, test, and ship meets or exceeds strict industry standards, ensuring your Powerstroke, Cummins, or Duramax gets the exact precision it deserves.

Real Results, Proven Track Record

Thousands of diesel owners trust us to unlock their engine's true potential. Our massive library of positive customer feedback and successful build case studies proves one thing: our kits deliver real horsepower, lower EGTs, and flawless reliability in the real world.

What exactly does an LML Duramax full delete kit remove from my truck?

A full delete kit removes the EGR cooler, EGR valve and EGR feed lines, the DPF and DOC canisters, and on the LML the DEF dosing system that older Duramax engines never carried.
Block-off plates cap the cooler ports on the cylinder head, a T304 stainless delete pipe replaces the DPF, and a delete tune shuts off the DEF and SCR logic.
The result is a clean intake, free exhaust flow and no emissions-driven limp mode.

What horsepower, torque and fuel economy gains can I expect?

Most LML owners pick up roughly 50 to 100 horsepower and several hundred pound-feet of torque once a tow or performance tune is loaded.
Fuel economy typically climbs 1 to 5 MPG because the truck stops burning extra fuel during DPF regen cycles.
Exact numbers depend on the tune, driving style and how heavy your right foot is.

Why does the LML Duramax need a full delete kit more than older engines?

The 2011-2016 LML is the first Duramax to carry the full EGR, DPF and DEF stack at once, and that triple load is what cracks coolers and clogs filters.
The LML EGR cooler in particular has a reputation for cracking and pushing coolant into the intake.
Removing the whole system as a matched kit addresses every one of those weak points at the same time.

What is included in a complete LML full delete package?

A complete package includes CNC billet aluminum EGR cooler block-off plates, a T304 stainless up-pipe, a 4-inch mandrel-bent DPF delete pipe, and a high-flow intake elbow.
High-temperature Viton O-rings and precision TIG welds seal every joint.
You pair the hardware with a delete tune and the right tuner to clear the codes.

Do I need a tuner or programmer to run an LML delete?

Yes. The ECM still commands the EGR, DPF and DEF systems, so you need a delete-capable tuner to disable them and prevent check-engine codes and limp mode.
Common LML options include EFI Live, EZ Lynk and MM3 setups loaded with tow or race tunes.
Our 24/7 support can point you to a tune that matches your hardware and use.

Which years and trucks does the LML Duramax full delete kit fit?

The kits fit the 6.6L Duramax LML in 2011-2016 Chevy Silverado 2500HD and 3500HD and GMC Sierra 2500HD and 3500HD.
The early LML generation runs 2011 through 2014, and the late LML generation covers 2015, 2015.5 and 2016 with running casting changes.
Always confirm your build year and intake elbow casting before ordering, whether you run a 2013, 2015 or 2016 truck, so the block-offs and up-pipe line up.

Can I still tow heavy loads after deleting my LML Duramax?

Yes. Towing is where a deleted LML shines, since lower EGTs and cleaner oil protect the engine under sustained load.
A moderate tow tune keeps the power delivery smooth and smoke-free for fifth-wheel and hotshot duty.
Many owners add a lift pump for clean fuel delivery on heavy tows.

Will deleting my LML lower my exhaust gas temperatures?

Yes. Removing the DPF canister and freeing exhaust flow drops backpressure and EGTs, especially under heavy throttle and long grades.
Lower EGTs reduce thermal stress on the turbo, pistons and the head gasket.
That is the core reliability win shop owners are after.

What materials and weld quality should I look for in an LML delete kit?

Look for CNC-machined 6061-T6 billet aluminum block-off plates, mandrel-bent T304 stainless steel pipes, high-temperature Viton O-rings and full precision TIG welds.
Cheap stamped plates and thin exhaust tubing crack, leak and throw codes within a season.
Our kits use shop-grade hardware built to hold up under sustained heat and boost.

Is deleting my LML Duramax street legal, and what are the shipping, warranty and return terms?

LML Duramax full delete kits are sold for competition and closed-course off-road use only, because removing emissions equipment violates federal and state on-road emissions laws.
Before ordering, confirm the fitment for your exact year and build, since late 2015.5 and 2016 LML trucks carry running casting changes.
We ship every kit with free shipping, back it with a 1-year warranty, and you are covered by a 45-day return policy if the kit does not fit your truck.