In this guide, we’ll show you how to get more power and better mileage out of your LML Duramax diesel equipped truck, by putting together the parts you’ll need for a full emissions (DPF and EGR) delete and tune.
The main objective is for your truck to reach its maximum tire-frying (or fuel saving) potential.
Deleting the failure-prone DPF and EGR emissions systems will allow your strangled truck to breath alot easier and run much more efficiently, all without having the worry of inevitable factory emissions equipment failure.
So, let’s get right down to it. There’s a ton of parts available for the 2011-2016 LML Duramax, and just as many choices on how to go about tuning it. Because of this, we’ve researched the marketplace and have come up with what we think are the best options available right now, and we’ll go over the what and why in the list below.
The best tuner for the LML Duramax
- H&S MiniMaxx DPF and EGR Delete Race Version
- DPF DELETE
- EGR DELETE
- Unlocked tuning and no unlock code needed.
H&S Performance Mini Maxx Race Tuner Unlocked
A tuner is a requirement when removing any computerized emissions systems.
The powertrain control systems in modern trucks are so heavily tied into the emission system, when you try to run without these systems installed you’ll end up just throwing the engine computer into limp mode. This kills your mileage and performance, unless you have a way of controlling the engine computer to edit those functions out.
One of the biggest requirements, and the first thing to look for in a tuner, is if it actually has the ability to actually delete the DPF and EGR systems. You’ll really want to make sure the tuner you get can do this, as there are some tuners out there that aren’t actually capable of programming the PCM to delete the factory emissions systems. We call these “tuners” paperweights.
The good news is that the H&S MiniMaxx Tuner does allow you control over the emission systems, and more. It’s a really great set it and forget it choice for the LML Duramax, think of it as a good starter tuner.
It’s not going to be able to push the limits of what your truck can do, but it will definitely be able to allow you to tune out the DPF and EGR and load up a pre-made tune for more HP or better mileage.
It’s not wallet busting either, fairly inexpensive for all the value that it gives back in tuning ability.
- PPEI Ez-Lynk Tuner
PPEI EZ Lynk AutoAgent DPF EGR Delete Tuner 2011-2017 Ford 6.7L Powerstroke & 2011-2016 GM Duramax LML
- Supports 2011-2017 Ford Powerstroke 6.7L
- Supports 2011-2016 GM Duramax LML
- Supports 2013-2017 Dodge Cummins 6.7L
The PPEI Support Pack for the AutoAgent will support the following vehicles for custom tuning: Ford: 2011 - 2017 6.7L Powerstroke Shift on the fly tuning with multiple power levels Shift on the fly 11-14 with stock exhaust: Stock 35HP - Tow 65HP - Street 100HP - Maxx Shift on the fly 11-14 with race exhaust: Stock 50HP - Tow 100HP - Street 150HP - Maxx Shift on the fly 15-16 with stock exhaust: Stock 35HP - Tow 65HP - Street 100HP - Maxx Shift on the fly 15-17 with race exhaust: Stock 75HP - Tow 135HP - Street 200HP - Maxx. 2011 - 2016 LML Duramax LML SOTF Power Levels: 30 HP - Optimized Stock 60 HP - Tow 100 HP - Street 150 HP - Race 200 HP - Maxx Effort (lift pump recommended) Datalogging Live vehicle diagnostics and troubleshooting Mobile app that communicates seamlessly with your vehicle The AutoAgent connects to the vehicles via the OBDII-port and broadcasts a Wi-Fi access point (AP) which allows a wireless connection to the vehicle using any iOS device or Android. By launching the free EZ LYNK application on an iOS or Android device, engine data is seamlessly streamed to the phone or other smart devices. The AutoAgent also has the capability to reflash vehicle system controllers with ECU profiles shared by technicians.
If you need more capability from a tuner, or if you want a tailored tune to squeeze the most out of your Duramax and it’s transmission, look no further than the PPEI EZ-Lynk.
This little guy takes the tuning of your Duramax to a whole new level. It’s the future of tuning.
You may notice that it doesn’t look at all like a traditional tuner, it completely lacks any sort of screen or buttons. This is because the EZ-Lynk is controlled completely by your smartphone. It works with Apple and Android phones, which gives it the ability to have what I believe to be one of the coolest tuner features I’ve ever seen: the ability to sync wirelessly with PPEI’s tuning “cloud” software.
That means that you can upload information directly from your truck to PPEI, and they can use that info to build you a custom tune. How sweet is that!?
It does cost a bit more than the entry-level H&S, but it makes up for it in features. The price tag also includes custom tuning by PPEI, which is highly regarded in the Duramax world.
LML DPF Delete Pipe
4" Stainless DPF & CAT Delete Pipes For 2015.5-2016 GMC Chevy 6.6L LML Duramax Diesel 6.6
- 4" Diameter Exhaust Pipe
- Mandrel Bent Stainless Steel Exhaust
- Bolt-On kit w/ All Necessary Pieces
4" Stainless Steel DPF & Cat Delete Pipes. 2015.5-2016 GM 6.6L LML Duramax Diesel with 3 Bolt Flange
This replacement gives your turbo a straight shot (besides the muffler, if you keep it) directly out the back of your truck. As you can imagine, a straight shot without all the restrictions of the emissions honeycomb not only sounds better, it flows way better than before which naturally = more power.
Flo-Pro makes many DPF delete pipes for many different models of trucks, they definitely make good fitting pipes and they’re reasonably priced.
LML EGR Delete Kit
EGR Valve Cooler Delete Kit For 2011-2015 GMC Chevrolet 6.6L LML Duramax Diesel
Competition tested at over 700hp this EGR delete is a must have for your drag or sled pull truck. Every EGR delete kit is manufactured from 304 stainless steel and billet aluminum. This race kit completely replaces the entire EGR system and can be installed in 6-8 hours without removal of the intake manifold. Product Features: Quicker turbo spool with lower EGTs Fully pressure tested Faster recirculation of the coolant resulting in lower coolant temps ** RACE Tuning is Required ** **THIS WILL NOT WORK ON 2015.5 MODEL YEAR**
Why not just get rid of the headache altogether. That’s where this kit comes into play.
Now, it’s true that the EGR function can be edited out of the tune with the H&S tuner, and the EGR valve kept in its place, in which case you wouldn’t need a blockoff plate. There’s a possible failure when you do that though, the boost pressure from the turbo can still overcome the EGR valve even if the function is turned off, causing exhaust gasses to leak past the valve and into the intake.
This blockoff kit eliminates that issue and ensures that the exhaust gasses cannot enter the intake tract at all anymore.
If you’re wanting to tackle the install of this kit yourself, or if you’re looking for more information about EGR deletes for the LML, take a look at the install portion of this post.
LML DEF/Urea Tank Delete
After you tune the emissions requirements out with the H&S MiniMaxx, and replace the exhaust to remove the DPF and DOC, you can then remove the terrible eyesore that is the DEF tank. This tank, if you hadn’t noticed, sticks out under the frame on the passenger side of your truck.
No more worrying about filling the urea. That alone is worth all the trouble of the emissions delete.
Just for fun, here’s a taste of some animal sounds coming from a tuned LML truck:
We hope this guide was helpful to you and gives you some direction on which parts you’ll need to put together and tune a full DPF and EGR delete package for your 2011-2016 Duramax.
Thanks for reading and if you have questions or anything to add, feel free to reach out in the comments below!