Duramax diesel engines are known for delivering dependable power, impressive torque, and strong towing capability straight from the factory. But for many truck owners, factory tuning leaves something to be desired. That is where performance modules come in. They offer a safe, plug-in solution to improve throttle response, fuel efficiency, and power output. At PSI Power Products, two of the most popular modules for Duramax trucks are the 61900 and 61720.

If you are trying to figure out which one is right for your truck, you are not alone. Both modules are designed specifically for the Duramax engine family, and both offer real gains without making permanent changes to your truck’s computer. But they are made for different models, and they work best when paired with the right engine and year range.

This article walks through the key differences between the two modules, what each one is built for, and how they can help your truck perform better in real-world conditions.

What Is the PSI Power 61900 Module?

The 61900 is PSI’s dedicated performance module for the 3.0L Duramax LZO engine, found in 2023 to 2025 GM trucks. This includes models like the Silverado 1500 and GMC Sierra 1500. These newer trucks come equipped with advanced emissions systems and tighter ECU controls, which make traditional tuning methods more complicated or risky.

The 61900 is a plug-and-play solution designed to work within these modern systems. It installs in minutes, does not require any cutting or splicing, and does not leave a digital trace in the ECM. Once connected, the module adjusts key signals like fuel timing and throttle input to improve responsiveness, boost torque under load, and reduce throttle lag.

Drivers who use the 61900 report better towing performance, smoother acceleration, and in some cases, small improvements in fuel economy. It is especially useful for light-duty diesel owners who use their trucks for hauling, trailering, or highway driving. The module is tailored specifically for the LZO engine, which means it delivers results without pushing the engine beyond its factory-safe limits.

What Is the PSI Power 61720 Module?

The 61720 module is built for a different segment of the Duramax family. This one is designed for the 6.6L Duramax L5P engine found in 2020 through 2024 heavy-duty GM trucks. That includes the Silverado HD and Sierra HD series. These trucks are often used for heavier loads and commercial-level towing, which makes controlled power delivery even more important.

Like the 61900, the 61720 is a plug-in module that installs without permanent modifications. It communicates with the engine’s computer to optimize performance in real time. The module focuses on improving torque and throttle response, especially when the truck is under load. This means better pulling power, more consistent acceleration when towing, and less shifting when climbing grades.

What makes the 61720 unique is its ability to enhance performance on heavier diesel setups without risking emissions compliance or voiding your truck’s programming. It stays within safe operating ranges and is programmed specifically for the L5P platform.

Key Differences Between the 61900 and 61720

The most obvious difference between the two modules is the engine they are designed for. The 61900 fits the 3.0L LZO engine in light-duty Duramax trucks from model years 2023 to 2025. The 61720 fits the 24-25 L5P engine in heavy-duty Duramax trucks from model years 2020 to 2024.

This means the 61900 is for half-ton trucks, while the 61720 is for three-quarter and one-ton trucks. That distinction is important. The modules are not interchangeable. Each is built with a specific tuning strategy that reflects the needs of that engine and the kind of work it is expected to do.

The 61900 is great for daily drivers, weekend towers, and anyone who uses a 1500-series Duramax for both commuting and occasional heavy use. It delivers smooth power increases without affecting drivability. It helps eliminate throttle lag and gives the engine more confidence when towing, without overwhelming the transmission or other systems.

The 61720, on the other hand, is for drivers who demand serious pulling power. If you haul heavy trailers, equipment, or RVs, the 61720 is tuned to give you more stable torque at lower RPMs, more responsive throttle input, and better fuel efficiency when hauling over long distances. It is ideal for those who depend on their diesel truck for work or travel.

Installation and Use

Both the 61900 and 61720 are designed for easy installation. There is no need for tuning software, reprogramming, or visits to a shop. Each module comes with instructions and mounting hardware. Most drivers can complete installation in under 30 minutes using basic tools.

Once installed, the module begins working automatically. There are no settings to adjust, and no need to recalibrate the truck’s sensors. The module operates passively, intercepting and enhancing engine signals while keeping the truck within its normal range of operations.

If you need to take the truck in for service, the module can be removed just as easily as it was installed. Since it does not flash or reprogram your ECM, there is no risk of leaving behind a tuning fingerprint that might trigger warranty concerns.

Real-World Benefits

Truck owners who use PSI modules often report similar benefits, regardless of which model they use. The most common feedback is improved throttle response. That means when you press the pedal, the truck moves. There is less delay, and the power delivery feels more connected and confident.

Towing is another area where these modules shine. Whether you are pulling a boat, trailer, or heavy equipment, both modules help the engine maintain torque without unnecessary shifting. This makes the driving experience smoother, especially on hills or during long highway stretches.

Fuel economy can also improve under certain conditions. While results vary based on load and driving habits, many users have reported modest gains in MPG when cruising at steady speeds or during light towing.

Which Module Is Right for You?

If you are not sure which module to choose, start with your engine type and model year. The 61900 is the right choice if you are driving a 2023 to 2025 Duramax 3.0L LZO in a 1500-series truck. The 61720 is your best fit if you have a 2020 to 2024 Duramax 6.6L L5P in a 2500 or 3500-series truck.

From there, think about how you use your truck. If you are mainly driving unloaded with occasional light towing, the 61900 will give you better drivability without sacrificing comfort. If you are consistently pulling weight or using your truck for work, the 61720 is tuned to help with load stability and long-distance hauling.

Both modules come from the same engineering foundation. They are made in the United States, tested for reliability, and backed by PSI’s commitment to quality and customer support. They do not require dealer programming, and they are fully reversible if you ever want to return your truck to stock.

Why PSI Power Products

PSI Power Products specializes in diesel performance modules built for real-world use. These are not generic chips or risky tuning files. Every module is engineered to work with specific engines and to stay within safe, factory-approved limits. That means no guessing, no permanent changes, and no unnecessary risk.

Each module is built in the United States and backed by a 30-day money-back guarantee. That gives you the chance to try it out and feel the difference for yourself. If it is not what you expected, you can return it. But for most truck owners, the improvement is something they notice as soon as they hit the road.

Final Thoughts

The 61900 and 61720 modules from PSI Power Products give Duramax owners two great options for improving performance safely and easily. Whether you drive a light-duty 3.0L or a heavy-duty 6.6L, there is a module built specifically for your truck.

You will see better throttle response. You will feel more stable power under load. And you will get those improvements without risking your warranty or modifying your engine permanently.

It is performance on your terms. Simple install. Noticeable results. Backed by experience.

To find the right module for your Duramax, visit psipowerproducts.com and explore your options today.