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Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016) - Stealth Performance Products
Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016) - Stealth Performance Products

Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)
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Regular price $600.00 Sale & FREE Shipping (US)

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Make your diesel have more efficient power and fun to drive with our Chevy/GMC Duramax 6.6L Stealth Performance Module exclusively for Chevy/GMC Duramax 6.6L years 2011-2016. Your module will be a stand-alone computer that simply plugs in under the hood of your truck.  It will not increase fuel volume, so there’s no need for any other modifications.  Make your truck work smarter, not harder!  Get that extra boost in performance without any harmful side effects.

Works with:

  • Chevrolet/GMC years: 2011, 2012, 2013, 2014, 2015, 2016 LML
  • Chevrolet/GMC diesel models: 2500, 3500

The Chevy/GMC Duramax 6.6L Stealth Performance Module provides: 

  • Better throttle response
  • Decreases turbo lag
  • An increase in low to midrange power where you need it
  • Increased hp, 120 ft-lbs of torque*
  • Reliable torque increase
  • Safe for towing and everyday driving
  • Stays within stock safety parameters
  • Stealthy technology does not leave a footprint in the ECM
  • Potential fuel economy gains. Most customers see a 10-20% increase with proper driving habits. 
  • Smooth and predictable power across the entire RPM prevents the transmission from struggling to find power and hold gears
  • Includes all weather factory style OEM plug and play connectors for quick and easy installation

How it Works:

The module is a stand-alone computer that plugs in under the hood.  The internal software meticulously works to optimize the injection pressure to amplify combustion efficiency.

By bringing the fuel rail pressure to its desired pressure sooner, it allows for finer fuel atomization.  In turn, elevating fuel-air mixture.  This allows for better combustion quality, efficiency, and power output.  The end result is more torque where you need it, less turbo lag across the whole RPM range, and increased throttle response.

We integrate with your Manifold Absolute Pressure sensor (MAP) to allow control and modulation of boost pressure utilizing your turbochargers variable vane control.

MAP integration and monitoring helps further improve engine responsiveness while keeping boost within factory safe levels.

Keep in mind, your truck’s stock safety parameters remain in place.  The module is a safe solution for every day driving and hauling.

Selectable vs. Non-Selectable:

  • The selectable module includes a switch with 4 modes:
    Stock, Low, Medium, and High
  • The non-selectable module does not include a switch. It comes preset in the Medium mode

Why sacrifice peace of mind when looking for a little bump in performance?  No endless modifications or flashes to your trucks computer.  This is the easiest and safest way to give your truck improved performance.  A cost-effective approach to wake your truck up starts here.  Backed by a limited lifetime warranty, includes 24/7 technical support, and superior customer service.  Finally a high-quality, safe, and non-invasive performance solution your truck has been waiting for. See why thousands of diesel pickup owners are turning to Stealth.

Mileage is impossible to guarantee with any modifications. Anyone that claims otherwise you should be very leery of. The majority of Stealth Equipped vehicles do see a mileage increase due to using the efficient low-end power our module provides to keep their RPMs down and hold higher gears. With responsible driving habits it's not uncommon to see a nice bump in MPG along with an all-around better driving experience. You're welcome to reach out to us so we can provide you with any tips we have learned from first-hand experience and speaking to tens of thousands of diesel owners.


Part Numbers:
SM3002E (Non-Selectable)
SM3002P (Selectable)

    • Shipping & Warranty


    Standard shipping takes 5 - 7 business days.

    Expedited shipping takes 1 business day.

    Note: Any orders made after 12:00pm EST may be processed the next day.



    You can read full details regarding returns, refunds, and warranty information here.

    Customer Reviews

    4.9 Based on 128 Reviews
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    Ryan Peabody verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2015 3500hd Silverado

    Love it no more dead petal!

    Ryan P.
    United States United States

    Awesome upgrade

    Great gains. Cuts way back on lag, quite a bit snappier, and very noticeable fuel economy

    United States United States
    JOHN M. verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)JOHN M. verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2016 High Country 3500 Dually

    I had an Edge tuner pulling a 20,000 Cyclone 4150 on heavy tow haul mode and would get 7.5 miles to the gallon. Installed the Stealth tuner making the same trip as before and got 10 miles per gallon. At this rate it will not take long for it to pay for itself.

    JOHN M.
    United States United States

    2016 Sierra Denali duramax

    So far so good had a issue installing it but even at 8pm I was able to be talked thru my problem, FYI it was not the product I had plugged it in wrong. 300 miles in midrange power towing and empty is better most of the dead peddle is gone! Mileage also seems to be up about 2mpg which is a nice plus.

    SCOTT R.
    United States United States
    Timothy C. verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2011 gmc 3500hd

    Nice and easy install! Made for a better acceleration response form the truck

    Timothy C.
    United States United States

    I’ve had one on my lml duramax for about 6 months now and absolutely love it! Noticeable increase in power and fuel mileage!! Would definitely purchase again and again!

    A Stealth Performance Products Customer
    Jared C.

    Installed one on my 15 Denali, all I can say is wow, helped out a ton on the turbo lag feels more responsive and gained 6 mpg on my first long trip!!! If you thinking about purchasing one all I can say is do it you will not be disappointed.

    A Stealth Performance Products Customer
    Jeremy H.
    Weston Henrichs verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2016 Denali 2500

    So far I have had it just over a week and it has increased my mpg by 2.5 mpg on the highest setting. I was told to give it a full tank on each setting to see what setting I like the most. So far I love the highest setting with the extra power and mpg. Super easy to install as well.

    Weston H.

    100% as advertised! Fast and smooth acceleration and shifting in my 16 Duramax. Extremely happy with this module, well done.

    A Stealth Performance Products Customer
    Jeff L.
    Joey Knoll verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    Ever sense Ive installed the tune my gas millage has increased 4 mph! The bottom end power is amazing. No check engine light. Installed in about 5 mins and instantly noticed a gain in torque and turbo boost. Would for sure recommend this product to everyone, its a must have!!

    Joey K.

    I put it on my 2016 Denali 2500HD could not be any happier. Best money I have spent. Took out all the throttle lag time and increased fuel mileage.

    A Stealth Performance Products Customer
    Frank D.

    Just put module on my 2016 duramax. Could not he happier with results. Proof is in the pictures. Increased milage immediately. Plus power! I have burned a bit more fuel after proving fuel economy but it sure is fun!! I recommend this to anyone wanting more power and better fuel milage

    A Stealth Performance Products Customer
    Rob K.
    Rick Delong verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2012 LML

    I wanted better throttle response without all the fancy and expensive upgrades came across stealth and my wife bought it for my Christmas this year and it works perfectly!

    Rick D.
    Kevin Kroll verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    Works Great!

    I ordered it for my 2016 Chevy 2500HD to even out the fuel mileage with leveling and adding bigger tires. With that being said, it actually got better fuel mileage then stock with the Stealth module and leveling with bigger tires. I have been seeing 2-3 MPG on the 60 setting with 4-5MPG on the 90 setting. Be careful running on the 90 setting for everyday driving my truck popped a code for running to rich. The support team was very quick to response and worked through the issue and it has been working great since.

    Kevin K.
    Jason Mosesman verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2016 2500hd crew cab long bed 4x4 pulling 11,000lb fifth wheel

    Very noticeable power increase at 1600-2200rpm on mid and high setting with a solid 2 mpg increase in mileage! Took 5 minutes to install! Very happy with my purchase, would recommend product to anyone!!

    Jason M.
    Liam Conner verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    2015 GMC Denali

    Great product ,quickly installed, and easily taken off for warranty service at the GMC dealership, added about 1.5 to 2 miles per gallon in town and on the highway, and really took care of that notorious duramax turbo lag, great product ,money well spent thanks guys !

    Liam C.
    Michael Fagan verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    Love the upgrade

    Easy to install and I like the added boost

    Michael F.

    Best on the Market

    Installed into my LML and noticed a big difference right off the start in throttle response and low end torque. Haven’t towed yet but excited to see how much of a difference it will make. I lost about 1.5 mpg when I installed my 35” tires but have gained so far 3mpg after my first tank. Everything is stock besides tires and my module. Well worth the investment and won’t leave a foot print when you take it into the dealer and take it off. You won’t be disappointed if you install this.

    Reed Anderson verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    Medium setting is definitely the way to go

    I spent 3 months researching and reading all the reviews on the stealth module. I finally bought it and I am extremely happy with it. We travel full time in our trailer. Our trailer weighs 16,000 lbs so my 15 Sierra 2500 needed a little something extra. I was getting 8.5-10 mpg towing and 15.5-16.7 before. With the tuner I'm getting 10-12mpg towing and 18.8-20 without the trailer. The throttle response is so much nicer. In the month I've had the module I've driven 3,000 miles towing, it makes towing much more enjoyable. Medium setting is deinfitely the way to go.

    Reed A.
    Craig Fillmore verified customer review of Stealth Module - Chevy/GMC Duramax LML 6.6L (2011-2016)

    Nothing fancy just workin daily.

    14.3 daily driver to 18.7 daily driver. Nothing beats a cleaner bottom line plus a little snappier performance. Might need more traction.

    Craig F.