19-21 Duramax L5P Stealth Module 19-21 Duramax L5P Stealth Module

19-21 Duramax L5P Stealth Module

$650.00
$650.00
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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 years 2019-2021. 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, 2021 L5P
  • Chevrolet/GMC  diesel models: 2500, 3500, 4500 chassis, 5500 chassis

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
  • Improves towing performance
  • 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.
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