LML Duramax Delete Kit: 2011-2016 Fitment, Tuners and Install

Which LML Duramax Trucks Do These Delete Parts Fit?

The Duramax 6.6 LML Full Delete Bundle fits 2011, 2012, 2013, 2014, 2015 and 2016 GM/Chevy trucks with the 6.6L LML Duramax. The EGR Delete Kit fits 2011, 2012, 2013, 2014, 2015 and 2016 GM/Chevy trucks with the 6.6L LML Duramax. The Tuner Harness Plug Kit covers the 6.6L LML Duramax in the 2011, 2012, 2013, 2014, 2015 and 2016 model years.

Here's the thing — this whole guide is built around one engine code. Get that right and the rest gets easy. Guess at it and you end up with a pipe on the garage floor that lines up with nothing.

Confirming you have the 6.6L LML, not an earlier Duramax

We get it. Nobody wants to be the guy holding a part that doesn't fit. Read the model year and the engine code off your own truck before you trust a forum post or a buddy's memory.

Now run the same check on the tuner you're eyeing. The EZ Lynk Auto Agent 3.0 fits 2011, 2012, 2013, 2014, 2015 and 2016 GM/Chevy trucks with the 6.6L LML Duramax. The EFI Live Autocal V3 covers the 6.6L LML Duramax in the 2011, 2012, 2013, 2014, 2015 and 2016 model years.

If the code on your truck isn't LML, stop right here. This guide was written for one engine, and it's a workhorse worth getting right.

Pickup trims versus Cab & Chassis trucks

Which body does your LML wear? Answer that before anything else.

The Duramax 6.6 LML Full Delete Bundle for 2011–2016 GM/Chevy Sierra/Silverado 2500 and 3500 permanently upgrades your truck to run without the factory emissions system.^[1] It fits all pickup trims, cab and box lengths, but not Cab & Chassis trucks, so call (888) 830-2588 for those.^[1] One phone call beats a return shipment every time.

Reading the fitment and price table

Let's break it down in one place. Find your part, check the years and the engine, then read across.

The Duramax 6.6 LML Full Delete Bundle is priced from $1,990.00 to $3,159.00. Hold onto that number for the next section.

Going piece by piece instead? The EGR Delete Kit is priced at $299.00. The Tuner Harness Plug Kit is priced from $169.00 to $189.00.

The two tuners get their own price talk further down, right where the choice happens. Year, engine code, body style: check all three against your truck and fitment is done.

What Comes in the LML Full Delete Bundle?

The Duramax 6.6 LML Full Delete Bundle includes the 4" Stainless DPF & CAT Delete Pipe. The Complete EGR Delete Kit comes in the box as well. Past that, it depends on your build. The bundle lists an Optional 5" Full Exhaust System. It also lists an Optional Muffler System.

The pipe and EGR hardware both options share

The good news? This part of the decision is easy. It comes in two bundle options, both built around a 4" stainless DPF & CAT delete pipe (other pipe variants are aluminized), a complete EGR delete kit, and a rotary switch, with an optional 5" exhaust and muffler.^[1]

That's the core of the delete, sorted before the box is even open. For a stock 2011–2016 LML starting from scratch, the Duramax 6.6 LML Full Delete Bundle is our pick. Starting from stock, fewer boxes means fewer surprises.

Piecing it together yourself works too. It just means more boxes, more phone calls and more chances to miss something.

Where the two options differ: the tuner

Now for the brains of the operation. Once the delete tune is installed, the "See Dealer" codes, check engine lights, "Exhaust system service required" alerts, and limp mode codes are gone.^[1] That's the part you actually feel from the driver's seat.

One bundle option includes the EFI Live Tuner and Delete Tune Software (not-preloaded) and all required accessories. The other bundle option includes the Ez Lynk Tuner with Preloaded Delete Tunes and all required accessories. The bundle includes a rotary switch to change power levels.

Preloaded or not sounds like a small detail. It isn't, and the next section shows you why.

The optional exhaust and muffler

Want to take the build past the core delete? That's what the optional pieces are for. Here's how we'd think about it.

On a sled-pull truck, the bigger pipe is worth a hard look. On a trail rig where every inch of clearance counts, keep it simple and stick with the core hardware.

Either way, make the call before the parts ship. That way you're not chasing a second box later.

Which Tuner Should Your LML Run: EZ Lynk or EFI Live?

The EFI Live bundle ships tunes by email that you load via the free EFI Live V8 software on a Windows 10 or 11 PC, and it runs four power settings: Stock, +30HP, +65HP, and +100HP, plus +130HP for modified trucks.^[1] Now for the EZ Lynk tuner. The five power levels are Stock, +50HP, +100HP, +150HP, and +200HP.^[2]

Buckle up — this is where your build gets its personality. Same truck, two very different ways to run it.

Power steps side by side

Let's start with the fun part. The Ez Lynk bundle ships preloaded, plug-and-play with the AutoAgent app for monitoring, adds Hiss and Rumble tunes, can factory-reset from the device, and runs Stock, +50HP, +100HP, +150HP, and +200HP.^[1] Line the two lists up yourself and you'll see exactly where they part ways.

Think of power steps like gears in a gearbox. You don't sit in top gear all day; you pick the one that fits the job in front of you, whether that's a pass on the dyno or a slow crawl up a rocky trail. Set up right, an LML on its top step is an absolute beast.

Phone app or Windows PC

Where do you want to do your tuning, in the cab or at a bench? The EZ Lynk Auto Agent 3.0 delete tuner for the 2011-2016 GM/Chevy LML Duramax wipes your ECM clean of every emissions-related code and puts five power levels in your hands, all from your phone.^[2] There's no screen, so you run it from any Apple or Android phone through the Auto Agent 3 app, reading and clearing DTC codes and monitoring live data.^[2]

It fits the 2011 through 2016 Sierra and Silverado 6.6L LML Duramax in 2500, 3500, and 4500 models, though Cab & Chassis trucks won't include Shift on the Fly.^[2] Between rounds at a pull, having everything on the phone in your pocket is the whole appeal.

Rather work from a laptop at the bench? Plenty of guys do, and there's nothing wrong with that. It comes down to where you're most comfortable working.

Transmission tuning and the manual transfer case

Here's where the choice stops being about taste. If your truck puts its power down hard, the transmission has to keep up with the engine, and that tune matters just as much. If you're going with the LML Full Delete Bundle, know this. Transmission tuning is included with the Ez Lynk package only.^[1]

Got a manual transfer case under your LML? This next part is for you.

Inside the box you get the EFI Live Autocal with all required cables, your custom VIN-built tune (not preloaded, Windows 10 or 11 required), the DSP5 switch, and emailed instructions.^[3] Cab & Chassis trucks and 2011–2016 LML trucks with a manual transfer case receive a single 0HP tune and no DSP5.^[3] That changes the whole math for that truck.

Our pick for which LML

So which one goes on your truck? For a 2011–2016 LML built to chase big numbers, the EZ Lynk Auto Agent 3.0 is our pick. On its own, the EZ Lynk Auto Agent 3.0 is priced from $1,864.00 to $1,939.00.

Watching every dollar? For a 2011–2016 LML on a tighter budget, the EFI Live Autocal V3 is the pick. On its own, the EFI Live Autocal V3 is priced from $1,034.00 to $1,234.00.

Still torn between the two? Tell us what the truck does on the weekend, and we'll point you at the right one. Run the manual transfer case check above first, though.

What Does the LML EGR Delete Kit Fix?

The EGR Delete Kit for 2011–2016 LML Duramax pulls the Exhaust Gas Recirculation system off your Silverado or Sierra and ends the soot buildup, stuck valves, and coolant leaks that turn into expensive repair bills.^[4] You'll need a compatible delete tune to tell the ECM the EGR is gone — pulling the hardware without updating the computer triggers check engine lights.^[4]

If you've owned an LML for any length of time, you've heard the EGR stories. Let's look at what's actually going on in there.

The soot, stuck valves and coolant leaks it ends

Ever had the intake off one of these and seen the black crust inside? Here's the problem it solves: the EGR system reroutes hot exhaust gas back into your intake, and over time that gas cakes soot on the intake manifold, clogs the EGR valve, and backs up into the cooler.^[4]

It's like making the engine breathe through a dirty rag, and it feels every breath. If your truck is throwing EGR codes or running rough under load, this kit fixes it at the source.^[4]

This kit physically blocks the EGR system so exhaust goes where it belongs — out the tailpipe.^[4] Simple as that.

What a failing EGR costs

Let's talk money. A failing EGR system can lead to overheating, head gasket damage, poor fuel economy, limp mode, and repairs that often run over $2,000.^[4]

Now flip back to the table up top and look at the kit's price. The math does itself.

Why the tune has to go with it

A lot of guys assume the hardware is the whole job. All hardware and gaskets are included, and the install is DIY-friendly with step-by-step instructions.^[4] Here's the thing — the hardware is only half of it.

Bolt in the parts without the tune and you've traded one headache for another. Going piece by piece? Line up the tune before the wrenches come out.

Why Add the Tuner Harness Plug Kit After an LML Delete?

The Tuner Harness Plug Kit for 2011–2023 GM LML and L5P Duramax trucks caps off your exposed OEM EGR and DPF (Diesel Particulate Filter) harness connectors after a delete — keeping moisture, dirt, and debris out of the connectors now sitting unused under your hood and beneath your truck.^[5] They dangle there, exposed to heat, water, and grime, and over time unprotected connectors corrode.^[5]

It's a small part. It's also the one people forget until a code pops up.

What happens to connectors left hanging

When you pull the EGR (Exhaust Gas Recirculation) and DPF systems, the factory wiring connectors that fed them don't go anywhere.^[5] Give them a season of mud and water and you'll find green crust on the pins. That corrosion can spread to nearby wiring and throw phantom codes that are a pain to diagnose.^[5]

Nobody wants to chase a code at the track that turns out to be one crusty pin. This kit seals all of it off before that starts.^[5]

Where the caps go

It provides the harness caps to keep water and debris out of the harness both under the hood and under the body of the truck.^[5] Under the hood is the easy half.

The caps under the body take the mud, water and rocks on the trail, so seat every one of them fully. Take a flashlight under there and find every loose plug before you start capping.

Which Duramax generations it skips

Own an older Duramax too? It does not fit Cab & Chassis trucks, and it won't fit LMM, LBZ, LLY, or LB7 Duramax generations — the connector profiles are specific to the LML and L5P.^[5] Fitment is for 2011–2016 LML and 2017–2023 L5P Duramax pickup models only.^[5]

Check the engine code on every truck in the garage before you assume one set of caps covers them all. It takes a minute and saves a return.

What Should You Expect During an LML Delete Install?

The EZ Lynk Auto Agent 3.0 is built for the LML Duramax. The device plugs into your OBD-II port under the steering wheel, then connects to the cloud, downloads your custom VIN-specific tune, and installs it, so there's no shipping your ECM out and no downtime.^[2]

Most of this job is sequence, not muscle. Get the order right and the rest is bolts.

Loading the tune before the hardware comes off

Tune first, wrenches second. On the PC route, the steps run like this. You download the custom tune built to your VIN from a Windows PC to the Autocal using the free EFI Live V8 software, plug it into your OBDII port, follow the included step-by-step instructions, then pull the physical emissions hardware.^[3]

A little time at the laptop up front beats a dash full of lights later. It's the easiest win of the whole job.

Where the delete pipe sits

Never had the exhaust apart on one of these? The DPF/CAT delete pipe isn't a full exhaust system, it only replaces the section of your factory exhaust that contains the emissions parts, specifically the "CAT" and the DPF (Diesel Particulate Filter). Those are the two barrel shaped parts in your exhaust near the middle of your truck.

The front end of the delete pipe connects to your down-pipe and the tail end of the delete pipe connects to the tail pipe, just before the bend over the rear axle. Think of it like swapping the middle cars of a train: the engine end and the caboose stay right where they are.

Get the truck up on stands with room to slide underneath, and line up a second set of hands for the long sections. Take a photo of the factory setup before anything comes off. Your back and your memory will both thank you.

Capping the leftover connectors

Save this for last, once the pipe is in and the tune is loaded. Each cap plugs directly into the OEM connector with no modification — easy to install, no tools, no guesswork — and leaves your engine bay with a clean, finished look.^[5]

Count the loose plugs before you start, and count the caps as they go on. It's the quickest job of the day, so don't skip it.

Getting the instructions

All delete kit instructions will be sent to you via email post purchase. Nobody loves reading instructions. Read these front to back anyway, before the truck goes up on stands.

What Should You Know Before You Order?

Tuners are built to order and non-refundable but replaced if faulty; pipes are final sale; the EGR kit is returnable unused within 30 days with a $30 restocking fee.^[1] Those terms cover the LML Full Delete Bundle. The standalone EGR Delete Kit includes all hardware and gaskets. Shipping is included; orders process within 1 business day.^[4] Returns on that kit are simple too. 30-day returns on unused kits.^[4]

Returns by part

Read that first line twice before anything ships. It's the reason the fitment check at the top of this guide isn't a formality. Pick the tuner once, and pick it right.

Not sure about a part? Ask before it ships, not after. We'd rather sort out fitment with you up front than watch a part sit on your bench.

The VIN form for the Ez Lynk

Have your VIN handy before you check out. After purchase you'll get a vehicle info form to fill out with your VIN, then we ship the EZ Lynk loaded with your tunes.^[2] Double-check every character before you hit send.

Fill it out the same day, and you won't be the reason the wait got longer.

Shipping and processing

Here's the timing on the standalone EGR Delete Kit. Shipping is included; orders process within 1 business day. Plan your install weekend around the parts landing, not the other way round. If the truck has an event on the calendar, work backward from that date.

Call us and we'll pair the right tuner.^[4] That's the easiest way to make sure the box on your doorstep is the one your truck needs.