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Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018) - Stealth Performance Products

Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)
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Make your diesel have more efficient power and fun to drive with our Chevy/GMC Duramax L5P 6.6L Diesel Performance Module exclusively for Chevy/GMC Duramax L5P 6.6L years 2017-2018. 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: 2017, 2018 L5P
  • Chevrolet/GMC diesel models: 2500, 3500

The Chevy/GMC Duramax L5P 6.6L Diesel 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
  • 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 spectrum, 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 Module:

  • The selectable module includes a switch with 4 modes:
    Stock, Low, Medium, and High
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:
SM3001P (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 70 Reviews
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      • Turbo lag
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      Dr. Coolidge verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2018 GMC Denali 3500

      A must have for the newer diesel trucks. Both my 19 power-stroke and my 18 Denali have them, and boy, what a difference. Throttle response is way better, and the power is all there. Highly recommended

      Dr. Coolidge
      United States United States

      2018 chevy 3500 duramax

      Installation was easy an the product made a difference love how it pulls know.thank you STEALTH.

      Blake T.
      United States United States

      Got ride if dead petal

      Got ride if dead petal and turbo lag and 1 to 2 miles better fuel mileage.

      Vance F.
      United States United States
      jeff groves verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2018 Chevy 2500hd

      I recently purchased the stealth module for my truck. It was very simple to install. I can definitely feel a difference in low end power. I was hoping for better fuel mileage.I keep it on the second level, and So far it remains about the same mpg as before. It got great mileage before at 19.6 mpg averaged over the last 11k miles. That’s empty and pulling a dump trailer.

      jeff g.
      United States United States

      2019 Chevrolet Duramax

      Had the stealth module on my 2016 duramax and saw 4 to 5 mpg gains across the board and truck had 75K mikes on it! I recently purchased one for my 2019 duramax and so far I have not seen the improvement as with the previous truck. However it only has 6K miles on it.

      Larry D.
      United States United States
      Jim Wilson verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2018 L5P All Terrain 2500 HD

      I'm absolutely blown away by the results! Dead pedal is gone! My truck now has immediate acceleration just like a naturally-aspirated engine. My MPGs have risen over 2 miles per gallon. I could not be happier with this thing, I have no need to do a flash tune. I feel like 99% of people would feel the same way. I was actually able to spin my tires pulling my tool trailer on dry roads. For those of you who own an l5p, you know how much power you get in 3rd gear. This module gives you that power right from the get-go. I was looking for a way to increase initial power, without voiding my warranty, this is it. Believe the reviews people, they are all legit trust me.! 5 days after I installed the module, I installed a cold air intake. Coupled together, you will have no need to flash tune! The module by itself is phenomenal. Installing a cold air intake, just adds to it. Do not spend thousands of dollars on a tune, when all you have to do is try this. You will be happy. Thank you Stealth!

      Jim W.
      United States United States

      2019 Silverado 3500

      This is my second module, I love them. The first was on a 2018 Ram 2500. I eventually deleted the truck and regretted it. It ran better on the stealth. So far I'm very happy with the one for the chevy. Need one for my 2500.

      Clay H.
      United States United States
      Stealth Performance Products

      Hey Clay! Thanks for the great feedback, we really appreciate it. We'd love to see a picture of your truck to share on our site.


      2017 GMC Sierra 3500 Denali

      So glad that I got the Stealth module . Customer service is great and unit came right away. It is so easy to install and customer service seems to always be available. Love how they check to make sure everything is ok. Really made a great improvement on the dead pedal and really like the extra Horsepower and torque. I would highly recommend this to anybody that wants to wake up there truck without Sacrificing your warranty.

      Roberto L.
      United States United States
      Frank Mirr verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2017 GMC Denali 3500

      So far the device is working great! I can feel the quicker throttle response, and the truck is a blast to drive.

      Frank M.
      United States United States
      Stealth Performance Products

      Hey Frank, thanks for the wonderful review! We have just shared it on the Facebook page and website!

      Kody M. verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2018 Chevrolet duramax

      Works great improved throttle response a lot and added 2 mpg

      Kody M.
      United States United States
      Stan V. verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)Stan V. verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2018 GMC 3500 Dually

      I'm happy with the Stealth Module. I notice better throttle response and better fuel mileage

      Stan V.
      United States United States


      For 2017 GMC Duramax...Easy install. Easy removal for service. Conservatively 3-4 mpg better (not currently towing). Way less turbo lag. Very satisfied!!!

      Jason B.

      Definitely helped turbo lag on my 2019 Chevy 3500

      A Stealth Performance Products Customer
      Chris P.
      Brady Dahl verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      Simple install

      Great experience, simple install and easy to read instructions. Highly recommend this product,one buddy has already ordered his. Big notice in power and driving 75 to 80 mph down interstate with empty truck 16.2 average fuel mileage. Very satisfied customer. Thanks again

      Brady D.

      I have an 18 Duramax and have had several issues with the truck going into limp mode. Not sure if it is a module issue or if the truck has issues but the customer service is amazing. While having technical issues calling the 888 number the owner took his personal time at midnight to call me and assist me in trying to fix an issue that very well may have nothing to do with the module and is continuing to help me get my truck running like it should! Best customer service I have seen in a long time!

      A Stealth Performance Products Customer
      Matt D.

      Great things come to Pass.

      Took 30 minutes to install, just cant believe the additional power and the increase in fuel mileage, Pre-ordered back in November 2017, glad I waited for it. Their Customer service is the best, always got updates on the progress of the Module upto and including the day it shipped. I recommended it to my Nephew , he just bought a 2018 D-Max. last week

      Mike Johnston verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)
      Mike J.
      Michael Klonica verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      2018 Silverado 3500 CCLB, 4.5" BDS Lift, 295/65R20 Nitto Trail Grapplers

      Love the turner!!! Bought after reading reviews and waiting for full delete to get through beta testing. Put on 6100 miles since I bought it and seen an average of 2.9 MPG increase! Running 78 mph I can avg 17.8 and around 14.7 mpg when running 85-90 mph. Would Highly recommend for anyone looking to wake up the L5P and get rid of the dead pedal.

      Michael K.
      Jimmy Howard verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      First time in cold and snow, ran like a beast!

      Eric Madrid is a very good dude, helped me through some quirks, always polite! And he answers his phone or gets back with a text.

      Jimmy H.
      JON REDMOND verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)JON REDMOND verified customer review of Stealth Module - Chevy/GMC Duramax L5P 6.6L (2017-2018)

      Shocking sigh of relief (long, semi detailed review)

      As you will hear from multiple reviews, we are all skeptical, took me 4 months to finally risk the money on this module. I immediately rushed out to install it when the ups man dropped it off. Since then, I have noticed that my MPG has risen, dead pedal is all but non-existent, and turbo lag has significantly diminished. Day to day driving is up about 34 mpg and Trailering has come up about 2-3mpg which shocked me the most. Also, love the length of the switch cable. Gives you options on where to mount other than just your common, under the steering wheel location. I mounted mine in the upper glove box, out of the way of accidental bumps from the legs. looking at levels(S,1,2,3) I have not tried the level 3 setting as I am not one to push my trucks limits until needed, I love it set on level 2 from day of install and reduce to level 1 when wife wants to drive haha. SUMMARY= Great Investment if you're not modding your truck but, just wanting cleaner response and drivability. I will definitely send my friends and family to order their stealth modules or I might give one away as a birthday gift. I will add a review after lifting my truck to see how it sits from there with more load

      JON R.