Diesel Tuner's Blog

What's an RPO? Crucial Duramax Information!

[fa icon="calendar'] Jul 18, 2022 6:00:00 AM / by Ben Lawson posted in LLY, Duramax, Duramax Power, LML, LBZ, LB7, LMM, L5P, L5D, LWN, RPO

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What's an RPO? Crucial Duramax Information!


This article will help you understand what an RPO is, how to find yours and when it will be needed.  An RPO or Regular Production Option is a GM-specific code, made up of 3 characters, that helps the manufacturer specify what configuration of options has been or needs to be applied to a vehicle. This can include anything from paint color to powertrain options. For Chevy/GMC Duramax trucks each type of engine can be signified by a different RPO code.


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Don't Delete Your 2017-2020 L5P Duramax DPF!!!

[fa icon="calendar'] Aug 26, 2020 10:15:00 AM / by Justin Tyson posted in Duramax Performance, Duramax, Duramax Power, DPF ON, DPF Delete, L5P

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Do you need to delete your L5P DPF?

We've all heard from forums and numerous outlets that deleting your DPF system is the way to go these days. What we never see backing these claims is data and tests. There is plenty of personal stories around a failed sensor or even the occasional DPF failure. However, once data starts fueling the debate on whether to delete or keep your emissions intact you may change your mind of what to do. 

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The History Of 6.6L Duramax

[fa icon="calendar'] Jan 3, 2020 2:28:45 PM / by Justin Tyson posted in Duramax, diesel performance

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The Duramax engine has a history that runs deep.  It has the following still to this day and continues to up expectations in terms of power and everything else. While it's history stretches back to 1982, we are going discuss the more modern years. The 6.6L was introduced in 2001 and replaced the 6.5L and the company hasn't looked back since.

2001 - 2004.5 LB7

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1,045 RWHP Duraburb

[fa icon="calendar'] Nov 17, 2016 4:47:54 PM / by Paul Wilson posted in Duramax, Stealth 64, Duraburb, twin turbo

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1,045 RWHP Duramax Powered Suburban



"There are few things in life more badass than a 1050rwhp Suburban.  I can't say enough good things about the team that made it happen.  Between my shop guys burning the midnight oil, Bob tuning it, and our awesome vendors Exergy and WcFab.  This thing is incredible." -Nick Priegnitz

This 2004 Suburban was originally converted to run a 2006, LBZ Duramax at Duraburb in Apopka, FL.  Back then, the truck had just a built trans, small drop-in turbo and stock CP3.  Now, it's a tire shredding, family hauling, quarter-mile blasting MONSTER!


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Drop-In Duramax Turbo Options

[fa icon="calendar'] Sep 7, 2016 2:17:28 PM / by Paul Wilson posted in Duramax Performance, Duramax, Duramax Power, 2013, 2014, 2016, 2011, 2015, LML, How to program my LML, More Power for my LML?, what are some upgrades I can go to my LML?, Turbo, 2012, LML Tuning, LML Power, Stock, Stock Turbo, Stealth 64, 2017, Stealth

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Drop-In Duramax Turbo Options

In the old days, there was no such thing as a "drop-in" turbo.  You pretty much had to buy a turbo that was designed for a different application and convert it to run on your Duramax.  Meaning the requirements for installation included several custom fabricated pieces to make it work.  

As technology in the diesel performance industry has advanced, our options for parts have expanded.  No longer do we have to use semi turbo's and roal coal to make power.  Now with the common rail injection system and variable vane turbo advancements there is a real need to find a turbo that makes more power than stock, while retaining all the benefits of a stock turbo. 

Benefits of a stock turbo:

  • Quick Spooling 
  • Clean installation
  • Reliable
  • Serviceable by any dealer or reputable shop
  • Requires no custom fabrication

Download Duramax Turbo Specifications

However, they do lack peak power, and peak power matters!  When looking for which upgraded unit to replace the stock turbo, we recommend matching the replacement as close as possible to the desired power level to minimize compromising drive-ability.  Any extra capacity you buy in peak for performance will cost you low end response.  Example: Looking to make 650rwhp? Buy a turbo that can just barely squeak out 650rwhp, do not buy something that's good for 850rwhp because it will drive poorly a light load. 

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#DTCLEANSWEEP - Parts List of how to make power!

[fa icon="calendar'] Sep 1, 2016 11:53:08 AM / by Danny Voss posted in Duramax, Emissions, Duramax Power, LML, Emisssions Intact Tuning, How to program my LML, More Power for my LML?, what are some upgrades I can go to my LML?, LML Tuning, Emissions Intact, LML Power

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 My name is Danny Voss, I have been working with the tuning department at Duramax Tuner on our emissions equipped truck to get the most out of our LML (2011-2016)  Duramax

"The Clean Sweep" is Calibrated Power Solution's Emissions intact pull truck designed to kick butt on the pull track and drive home like nothing happened.  This truck is the true definition of a sleeper.  When I get on the throttle, the responsiveness is unbelieveable.  

Here are the TOP 3 Reasons why Duramax Tuner choose to do this project:

  • The EPA frowns on removing emissions equipment.
  • The future of our industry is going in the direction of CLEAN POWER.
  • To show the world we can make CLEAN, RELIABLE and LEGAL power.
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LML Stealth 64 VVT, 620 RWHP Drop-In Turbo

[fa icon="calendar'] Aug 26, 2016 5:02:54 PM / by Paul Wilson posted in Duramax, 2013, 2014, 2016, DPF Intact, DPF ON, 2011, 2015, LML, Emisssions Intact Tuning, More Power for my LML?, what are some upgrades I can go to my LML?, 2012, LML Tuning, Emissions Intact, LML Power, clean sweep

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LML Stealth 64 VVT by DuramaxTuner.com


The Stealth 64 turbo lineup has provided Duramax and Cummins owners the perfect drop-in, upgraded turbo option to net 80-120 extra horsepower.  It spools like stock, appears stock, and still makes good power.  The Stealth 64 lineup has already supported the 04.5-07 Cummins and the 01-10 Duramax.  Significant changes in design of the factory turbo slowed our entrance to support the 2011 - 2016 Duramax trucks.  Until now! 


This turbo has an upgraded compressor and turbine.  It's a direct bolt in for the factory charger on the LML (Custom tuning Highly Recccomended!)

  • #DTCleanSweep Video
  • 500+ HP Emissions Intact Cummins
  • Learn more about Emissions Equipment
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How much boost should my stock Duramax turbo make?

[fa icon="calendar'] Jul 28, 2016 11:45:05 AM / by Paul Wilson posted in Duramax, Turbo, Stock, Stock Turbo, Drop-In, Stealth 64, Wheel Size, Turbo Wheel, Stealth

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Duramax engines have always come with solid turbos. However after miles and miles of whistling and boosting, your turbo may have problems. Or you may have other issues, that make you think your turbo has problems. This is very common as most drivers watch boost, keeping an eye on how much PSI they're making. It stands to reason that if your peak boost drops, your turbo has a problem. This is usually not the case though. More often then not, when we diagnose this symptom we find there are other problems leading to a lower than expected boost number. 

Target boost numbers for the following RPO's are as follows (PSI)

2001-2004 LB7- Stock 20-22, tuned 24-26, tuned with PPE boost valve 28-31.  Failure will occur near 34psi

2004.5-2016 Stock 22-24, Mild tune 27-28, Hot tune 33-35

The factory map sensor which electronically measures boost on a 2001-2004.5 trucks only reads to 22-24 psi, 2006-2016 MAP sensors read to 37 psi.  If you want to read boost numbers higher you'll need an aftermarket gauge. 

Stealth Boost Tester


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How does REGEN work in an LML Duramax?

[fa icon="calendar'] Jul 6, 2016 10:30:43 AM / by Paul Wilson posted in Insider, DuramaxTuner.com, Duramax, Emissions, EGR Delete, 2013, 2014, 2016, Add blue, DPF Intact, EGR ON, DPF ON, 2011, 2015, New Diesel, LML, Diesel Tuning, More Power for my LML?, Urea, 2012, Delete, DPF Delete, Urea Delete, LML Tuning, Emissions Intact, EGR

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REGEN is the burning of soot built up in a DPF. 

 The Emissions Equipment for diesel trucks has changed quite a bit through out the years. In 2004.5 all heavy duty diesel pickups had to install EGR's which is the exhaust gas recirculation system. Basically it turns exhaust into inert gas and directs the gas back into the combustion process. Then in 2007.5 the EPA required pickups to use a DPF. The DPF, or Diesel Particulate Filter, is a filter that catches soot, or unburnt fuel from the exhaust. Once the soot builds up, the exhaust heats up to burn the soot off. Starting in 2011 Diesel Exhaust Fluid is used to treat NOx emissions, in addition to the EGR and DPF treating the carbon emissions. 

The DPF is a crucile part of treating diesel emissions and each OEM utilizes and operates their DPF a little differently. Below, the DPF in the 2011-2016 LML Duramax is explained.


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6 Questions about Tuning your LML Duramax

[fa icon="calendar'] Jun 22, 2016 2:00:00 PM / by Paul Wilson posted in Insider, Duramax Performance, Mods, DuramaxTuner.com, EFILive, efi live, Modifications, Duramax, Emissions, EGR Delete, Duramax Power, What can I do to get better fuel mileage?, 2013, 2014, 2016, Add blue, DPF Intact, EGR ON, DPF ON, 2011, 2015, New Diesel, LML, Emisssions Intact Tuning, Diesel Tuning, how to get more power from my duamax, How to get more power from my Duramax, what are some upgrades I can go to my LML?, Urea, 2012, Delete, DPF Delete, Urea Delete, LML Tuning, Emissions Intact, EGR, LML Power

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Did you know there is no reason to delete the emissions from your 2011-2016 Duramax? 

DuramaxTuner.com's SPADE is capable of adding up to 135HP to your EMISSIONS INTACT LML

Actually, more and more people are tuning their 2011 + Duramax (LML) with the emissions equipment intact.  This is a great option for Duramax owners that would like a nice, quiet, reliable, efficient truck that performs well every time. However, many LML Owners have some basic questions prior to pursining emissions intact tuning. 

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