2024 Duramax Derringer Tuner Adds Power & Torque
Watch Gale Banks explain how we make the latest generations of the Duramax out–tow all previous generations. The new Derringer High Output tuner brings the ’24-’25 Duramax 6.6L from 438 hp and 928 Ib-ft to a tire-shredding 519 hp and 1068 Ib-ft. Rocket uphill, pass slow-moving traffic and merge effortlessly while towing in your 2024-2025 Duramax 6.6L thanks to Derringer’s massive +178 lb-ft of torque and +86 hp.
Full Video Transcript
00:00 Whether you’re fully loaded, accelerating up an on-ramp, or out on that lonely two-lane trying to pass that semi, laboring up the grade, you’re really working your truck. This is the Banks Derringer High Output for the 2024–2025 Duramax L5P. It adds 178 pound-feet of torque and 86 horsepower.
00:24 But where we put the torque and horsepower is all new. We provided a huge increase in torque across the working range of the engine between 2200 and 2800 RPM. We did this by controlling mid-range boost. Look at the yellow zone—mid-range boost equals mid-range torque. Derringer adds torque where you need it: in the mid-range.
00:48 Derringer has six power levels, each a custom calibration. Level two is a fuel economy tune. Three and four are for work. Levels five and six are for max power and just plain hauling ass. The Derringer system is plug-and-play and designed to be installed in your garage.
01:08 And your power and drivability will only improve with the new 50-state compliant Ram-Air Intake, Monster Ram, and Boost Tubes, which are all available now.
Why Midrange Torque Matters When Towing
Peak horsepower numbers do not tell the whole story when a diesel truck is towing. The engine spends much of its working time in the midrange, especially while climbing a grade, entering a highway, or accelerating to pass with a trailer. Banks designed the Derringer High Output calibration to add torque across the 2,200–2,800 rpm range where the 2024–25 L5P Duramax regularly works under load.
The system provides six selectable power levels. Lower settings support stock operation and economy-focused driving, while the work and maximum-power settings let the driver select output for the situation. Banks reports maximum gains of 86 horsepower and 178 lb-ft at the wheels. These gains occur across the power curve and should not be interpreted simply as the difference between the listed stock and peak-output numbers.
Derringer also works with the Banks iDash Pro, allowing the driver to change power levels and monitor available engine and powertrain data. The result is adjustable power aimed at real towing situations rather than a single peak dyno number. Drivers should still follow Banks installation instructions, maintain the truck properly, and stay within the vehicle manufacturer’s towing and weight ratings.