39 reviews

2011-2016 Duramax 6.6L LML PRO DIESEL Performance Module

Diesel Pro Modules

Fits Chevy/GMC Duramax 6.6L LML (2011-2016)

  • 2500HD & 3500

Horsepower Select Knob:

*30 HP - Heavy Tow
*60 HP - Best Mileage and Tow
*90 HP - Mileage and Light Tow


  • Simple Install: EZ Plug-n-Play technology that you can install "in minutes" by simply connecting to your engine's wire-harness with factory style connectors.
  • Fuel Mileage: 10-20% improvement (get up to 100 more miles per tank of fuel)
  • Power Increase: Safe/Smooth low to medium range power for daily driving and pulling loads (Max 100 ft/lbs Torque)
  • Throttle Response: No more turbo lag... quicker Get Up & Go
  • Engine Safe: Performance gains stay within Stock parameters
  • Transmission Safe: Engineered for working-class daily drivers
  • Proven: Installed in tens of thousands of diesels since 2003
  • No Additional Mods: No need to delete emissions or add additional mods
  • Warranty Friendly: Leaves no "fingerprint" in the factory computer

Don't be frustrated with your mileage... improve it!

Since 2003 we here at Diesel Domination Inc have focused solely on upgrading "Working-Class Daily Drivers". We truly believe the "original" Dr. Performance Pro Diesel Modules are the Safest, most Warranty Friendly diesel performance products on the market.

The Pro Performance Module is the proven SAFE and WARRANTY FRIENDLY way to increase your dieselu2019s fuel economy and towing ability without the hype, hazards, and hidden costs associated with most diesel chips and delete kits.

Tenu2019s of thousands of hard-working diesel truck owners just like you are now experiencing incredible money-saving fuel mileage gains and more towing power because they upgraded their trucks with the easy to install Pro Performance Module.

So effective is the Pro Performance Module at giving you both optimal fuel mileage and power gains, that it makes other diesel performance products nearly obsolete.

The price is affordable for almost any budget and easy enough for anyone to install. If you are frustrated with less than optimal fuel mileageu2026 you now have a solution!

If you are daily driving or going cross country, 100 EXTRA miles per tank of fuel adds up fast when it comes to money in your wallet. Stopping less to fuel up makes traveling more enjoyable and more affordable when you are saving $20 for every $100 in fuel. (up to 20% MPG increase)


You feel like your truck has plenty of power but the fact is Emission Standards have forced manufactures to de-tune your truck below 2000 RPM. This de-tuning has caused diesels to lose mileage over the years.

To restore your truck's fuel mileage, you must change the "peak efficiency" of the motor to match your driving/towing RPM speed. Increase the low-end torque rise of your motor significantly improves fuel economy because the engine now does more work with less effort.

After increasing low-end torque many of our diesel customers tell us their trucks that were once getting 13-16 MPG and are now seeing up to 18-23 MPG.


The main difference between the Pro Performance Module and most electronic diesel performance products is the manipulation of fuel pressure vs fuel volume. Most chips/programmers change injector pulse width which adds for fuel to the engine... the Module changes fuel pressure which enhances the injector plume and increases the fuel atomization.

Excessive injector pulse width modification adds too much fuel volume and can cause the engine to run rich (smoke/heat)... whereas pressure/plume modification causes the engine to run more efficiently due to improved fuel atomization. Pressure modification does add slightly more fuel under throttle but the additional combustion performance offsets any negatives.

The Number One reason customers install the Performance Module is for fuel savings but having up to an additional 90 horsepower (140 ft/lbs torque) makes for a more responsive truck when towing heavy loads. You can now get heavy loads moving faster and keep them moving faster on steep grades with less downshifting. (faster turbo spool gets you through intersections quicker)

The Pro Performance Module is an easy to install u201cplug and playu201d diesel performance product suitable for todayu2019s hi-tech diesel engines. Engineered with advanced digital-microprocessor technology, the Module simply plugs into your factory wire-harness with OEM style plugs and helps manages your engineu2019s fuel delivery with precise electronic control of injection pressure.

Pro Performance Module gives you proven results with the u201cbest of both worldsu201d. You get incredible money-saving benefits of better fuel economy and an amazing engine performance increase and at the same time! Instead of being frustrated with your diesel, simply upgrade it with a Pro Performance Module and get the fuel mileage increase and first-class towing power gains you deserve.


You can't just wish for better mileage and do nothing... You must change your diesel's "peak efficiency" to increase your fuel mileage.

Add the Pro Performance Module to your Cart "RIGHT NOW" and start experiencing for yourself what thousands of hard-working Powerstroke, Cummins, and Duramax diesel owners are already enjoying.


Customer Reviews
4.5 Based on 39 Reviews
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Filter Reviews:
Craig K.
United States United States
I recommend this product
Very Impressed!

The Pro Diesel Performance Module is everything they claim. More horsepower and better fuel mileage. I pull our 36 foot 5th wheel RV trailer on flat land, up a mountain pass, and through the the forest here in Eastern Idaho frequently.

Ken D.
United States United States
I recommend this product
Was skeptical but works like I need.

Installed it on my '11 GMC LML, set it on 60hp & drove it a bit, very noticeable increase in acceleration. Set to 30hp/towing & towed my 16k 5th wheel 500 miles with several steep hills. Filling in the fuel curve below 2200rpm (or so) helps with some hills allowing the truck to pull them without the 5-4 downshift. It DOES ramp in fuel pretty quickly as hills steepen so it hits the downshift before I see 19psi boost like stock. Even when not towing the 30hp mode helps the sluggish "off the line" at stop lights. I HATE when the computer second guesses my right foot & doesn't give me the throttle I want. I haven't seen any noticeable change in fuel economy yet.

Pro Diesel Modules 2011-2016 Duramax 6.6L LML PRO DIESEL Performance Module Review
James P.
United States United States
I recommend this product

Excellent, mileage improved. Power about the same. Always ran like a scared cat.

terry n.
United States United States
I recommend this product
Good product

Easy install maybe 10 minutes to do and fuel mileage went up 3mpg

Tom L.
United States United States
LML Pro Module

Easy install, but the performance advertised is not correct. The performance # 3 setting doesn't do what they say, they said it adds 60 or 90 horsepower, it doesn't. But on economy mode it does get better mileage. Still testing it.

Michael B.
United States United States

Not sure doesn't seem to help much towing but helps when not towing

Jim H.
United States United States
good job

I like the better millage when towing as long you don't push the speed limit. On a trip back from NV. 1200 miles we got 26 mpg. all this time I have used the mid. setting. Most of towing is a 27' snowmobile trailer 12 to 17 mpg.

John B.
United States United States

K I haven’t hooked it up yet as I am waiting for my nephew to come out and help me as it’s hard for me to get up inside the truck

Terry P.
United States United States
Jury still out

Can’t tell any difference yet. To early to tell.

Keith J.
United States United States
My 2015 GMC

So far not much different. I haven’t did any heavy hauling yet. I’ve only put on 800 miles. About the same mpg.