The 2018 L5P is already a strong-running truck in stock form, but the Banks Derringer Tuner changes how the truck responds when you ask for more. The big difference is torque delivery. From a low-speed roll and through the midrange, Level 6 brings in a much stronger pull that you can feel immediately. That matters in the real world, because passing, merging, and towing response all depend on how quickly the truck builds torque when you lean into the throttle. This is exactly where adjustable power levels make sense: stock when you want it, added shove when you need it.
The video opens in a 2018 GMC Sierra Denali 3500 HD during a quick validation drive. The truck's interior is briefly praised, but the focus is on comparing power delivery between the stock calibration and a higher performance setting. The test is informal but structured enough to highlight the difference in acceleration feel under similar driving conditions.
The first run is performed on the stock setting. From roughly 40 mph, the driver rolls into the throttle at about 60 percent and then pushes harder through third and fourth gear. In this configuration, the truck feels reasonably strong and responsive. The impression is that the Sierra is respectable in factory form and certainly not sluggish, but the power delivery still feels somewhat restrained or muted.
After establishing the baseline, the setting is changed to level six using the selector button. The reason given is simple: the driver wants more power than the stock setup provides. The comparison is intended to repeat the same general driving scenario so the difference in torque and acceleration can be judged directly rather than guessed at.
With level six engaged, the driver begins with a gentle roll-in from about 10 mph. Even before a full-throttle hit, the truck responds with a much stronger surge. The increase in output is immediately obvious, especially as the truck accelerates through the lower-speed range and into the midrange. The added torque is described as highly noticeable and is felt as a strong, building pull rather than just a small increase in responsiveness.
The most dramatic change is reported in the 40 mph range. From about 40 mph, the truck's torque increase is obvious enough that it changes the character of the vehicle. Instead of merely feeling adequate, the Sierra now feels substantially larger and more forceful in the way it accelerates. The emphasis is not just on peak output, but on the pleasurable sensation of torque building hard through the gears.
A second low-speed test starts at about 10 mph in second gear. The driver rolls into approximately 70 percent throttle and carries the pull toward 40 mph before adding more throttle. The response is immediate and much quicker than the stock run. This reinforces that the improvement is not subtle; the truck accelerates harder and feels significantly more energetic under the same kind of real-world throttle application.
The recap concludes with the truck being characterized as a much bigger-feeling machine in this higher setting. The stated output figure is 505 horsepower and 1,001 lb-ft of torque, which is presented as the effective engine rating in this configuration. In practical terms, the added power is framed as especially useful for tasks such as towing a trailer, but even without a load the main takeaway is clear: compared with stock, the truck delivers a far stronger and more noticeable torque-rich acceleration experience.