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Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020) - Stealth Performance Products

Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020)
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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 L5P 6.6L Diesel Performance Module exclusively for Chevy/GMC Duramax L5P 6.6L years 2019-2020. 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: 2019, 2020 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 Number:


  • 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
5 Based on 12 Reviews
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  • Turbo lag
  • module
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  • Duramax
  • fuel mileage
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2019 Chevy 3500 HD Duramax

My '19 is my third Duramax but the first that I have added anything aftermarket to. I noticed an almost immediate difference in turbo lag as soon as I hooked up the Stealth Module. I have put about 1000 miles on the truck (with it set on medium) since and am averaging almost 3 MPG better fuel economy. So far, it's a no-brainer!

Michael C.
United States United States
Stealth Performance Products Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020) Review

2019 GMC 2500 HD Denali

Absolutely could not be happier with my Stealth Module, instant throttle response, more power and torque ( not that it needed any). I pull an equipment trailer and module does everything as promised and then some. I haven’t had it on long enough to estimate new fuel mileage, but I’m impressed and so is everyone behind me

Mason V.
United States United States

2019 GMC Sierra 2500hd Denali

After lifting my truck and putting 37x13.50s on it my average mpg dropped to 11.4 around town now I'm averaging 12.6. Not a huge boost in mpg but I'll take it considering it comes with a good amount of extra torque. I get a lot more response from the throttle now. So no more dead pedal when I'm trying to pass granny on her sunday cruise.

Robert B.
United States United States

2019 Chevy 2500HD

So far so good. 3-4mpg increase on mileage. Like it so fsr

William D.
United States United States

2019 GMC Denali 3500

I have had the module for about 3 weeks now and love it. It does everything as advertised. Thank you Stealth!

Bryan L.
United States United States
Stealth Performance Products Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020) Review

2019 Chevy Silverado ltz l5p duramax

Completely blown away by the difference the stealth module makes, I bought it for the mpg but would buy again for the power increase, truck has no lag at all, medium mode is the best for me and has the best mpg, but I use high on long trips or if you want to drive fast. I had 1800miles before it with an average of 12.7 mpg, now with 1800 more miles my average is 16.1 and I’m driving faster now to boot, I’m definitely a believer and the installation only took 5 minutes, great buy

Stoney M.
United States United States
Stealth Performance Products Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020) Review

2019 Denali 2500

Module does everything they said!!! This is the second one for me!!! Great product and Great people!!!

Edward B.
United States United States

Chevy hd2500

Very pleased with unit have setting on 3 very good pedal response no turbo lag install was easy took longer to route harness up out of sight

United States United States
Stealth Performance Products Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020) Review

2020 GMC Sierra 2500 AT4 HD

Having had diesels in the past I knew of the dreaded turbo lag. I knew I wanted something to eliminate that on my new tow rig. I wanted something to give the 6.6L Duramax a little more pep as it has plenty of power already. Did a little research and settled on the Stealth Module. The module was very intuitive and easy to install. After the install I had to take it for a quick test drive. Set the dial to everyday mode and instantly noticed better throttle response and almost no turbo lag. Two days later I set the dial to heavy tow and hooked up to my 10k camper and headed for the North Georgia mountains. I caught myself constantly having to monitor my speed and ease off the throttle. The power and torque was plentiful. I just waived at all the other trucks with their sleepy engines as we blew by them going up the mountains. I felt as though the truck had endless power and speed, never felt like I needed more. Over all the module has performed as advertised and perceived value is well worth the cost. Great job Stealth Performance Products.

Chris R.
United States United States
Stealth Performance Products Stealth Module - Chevy/GMC Duramax L5P 6.6L (2019-2020) Review

2019 Chevy Silverado 3500 DRW

Awesome, just awesome. Immediate throttle response better fuel economy! Should’ve bought this module sooner!

Daniel B.
United States United States

GMC 2500 desiel 2019

It has increased my mileage by 3 miles to the gallon and the power is good

United States United States

2020 silverado 3500 hd

Been using it everyday pulling mini ex and skid steers around and love it so far. The power difference is very noticable and unloaded fuel mileage is 2-3 mpg better but not without a trailer of some kind very often! Does exactly what was advertised.....very happy!!

john j.
United States United States