2024–25 Duramax Derringer Tuner Upgrade
The Banks Derringer High Output tuner is the safest and easiest way to add power to your new Chevy or GMC 6.6L Duramax. Unlike expensive flash tuners that cost 4X the price, you can install Derringer in minutes without fear of permanent changes to the truck’s ECM that can be spotted by your dealer. Derringer adds a huge amount of dyno-proven performance throughout the working range of the engine.
- Power increase across entire working range of engine
- +86 hp and 178 lb-ft
- Six power levels for any situation
- Makes merging and passing while towing effortless
- Hit 70 mph 200 ft sooner when towing
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 a semi, laboring up a grade — you’re really working your truck. This is the Banks Derringer High Output for the 2024–25 Duramax L5P. It adds 178 lb-ft of torque and 86 horsepower.
00:24 But where we put the torque and horsepower — and how we tested the performance — is all new. We focused on providing a huge increase in torque across the working range of the engine, between 2200 and 2800 RPM. We achieved 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 most.
00:47 And just so you know, we built 26,000 JLTV engines for the Army using the same tuning approach that we’re now applying to your Duramax. The mid-range is where you actually work your truck, so this is where we focused.
01:08 Most interstate on-ramps are about 1,000 ft long. The speed of the merging zone is usually set by semis, typically around 70 mph. That means you’ve only got 1,000 ft to hit 70. The heavier you tow, the harder this becomes.
01:29 To test the new Derringer in this real-world scenario, we loaded a Tacoma into our trailer and hitched it to our 2024 Duramax. Gross vehicle weight was 20,065 lbs. On a straight, flat road, we put it into four-wheel drive to avoid wheel spin and performed a series of acceleration tests.
01:54 The stock 2024 Duramax took 1,279 ft to reach 70 mph. With the Banks Derringer tuner set to level 6 (max power), the rig hit 70 mph at just 1,085 ft — that’s 194 ft sooner. In other words, you’re safely merging with semis while the stock truck is still accelerating and duking it out in traffic.
02:16 Now, let’s look at an even harder situation: passing while towing uphill. With a gross weight of 20,000 lbs, we measured 45–70 mph acceleration on a 7% grade.
02:40 At wide-open throttle, the stock 2024 Duramax took 23.6 seconds and 2,092 ft to complete the pass. The Derringer-equipped truck did it in just 15.1 seconds and 1,336 ft. That’s 8.5 seconds and 756 ft saved — 36% less time spent on the wrong side of the road.
03:09 Derringer has six power levels, each with a custom calibration. Level 2 is a fuel economy tune. Levels 3 and 4 are for work. Levels 5 and 6 deliver max power and just plain hauling ass.
03:30 We’ve paired Derringer with the all-new iDash Pro — a powertrain information and control center. With iDash, you can monitor real-time engine and powertrain conditions that GM doesn’t display, adjust Derringer’s power level on the fly, and even control throttle response if you own a Banks PedalMonster.
03:49 The Derringer system is plug-and-play, designed for DIY installation in your own garage. And your power and drivability will only improve with the new 50-state compliant Ram-Air intake, Monster-Ram, and boost tubes — all available now.