The real difference with the Banks Derringer Tuner on the L5P is not just peak output. It is how the power is delivered. Instead of acting like a basic box that only adds fuel, Derringer communicates through OBD-II and uses live vehicle data to manage tuning in real time. That gives it the ability to watch operating conditions, limit full power until the truck is up to temperature, and add transmission- and EGT-aware control that helps protect the engine and Allison under load. For owners who want stronger response without giving up reliability, that is the point: usable power with safety logic built in, not power delivered blindly.
The video begins by laying out the criteria used to choose a tuner for the L5P Duramax truck. The main priorities were horsepower, reliability, and safety. Power mattered most, but it was not considered in isolation. The tuner also needed to manage vehicle parameters carefully enough to avoid engine damage or transmission problems. In practical terms, that meant looking for a product that could add meaningful performance while still protecting the truck from excessive stress.
Several options were considered for this truck, including the AFE Scorcher, the Stealth module, and the Banks Derringer tuner. After comparing the available products, the decision was made to use the Banks unit. The choice was presented not simply as a preference, but as the result of weighing power output against the supporting safety strategy built into the tuner.
A major reason for selecting the Banks Derringer was its reported power advantage. Independent dyno testing by Hardway Performance compared the tuners currently available for the truck by running the vehicle in stock form and then testing each module on the dyno. According to that testing, the Banks Derringer produced the highest power numbers of the group. That result aligned with Banks' own published dyno data, and the presenter noted that Hardway Performance saw the same gains on their trucks. For a buyer focused first on horsepower, that independent confirmation was a key factor in the decision.
The video also explains the available tuning levels. When paired with the iDash, the Banks system can provide up to six power levels. In this case, the iDash was not used; the simpler switch-based setup was chosen instead. That configuration provides three modes: stock, a mid-level tune, and the full-power setting. In the highest setting, the claimed gain is 61 horsepower. The presenter emphasizes that this number is supported both by Banks' dyno charts and by the independent testing mentioned earlier. Even though the truck would likely spend most of its time on the highest setting, the ability to change levels was still seen as a useful feature.
What separated the Banks tuner from the others, in the presenter's view, was not only the added power but the amount of attention given to drivetrain protection. The discussion specifically highlights transmission safety and exhaust gas temperature control. The tuner uses the vehicle's OBD-II connection, which is described as a unique feature compared with some competing products. By accessing vehicle data through that port, the system can monitor operating conditions and limit power when necessary.
The video states that the tuner checks parameters such as EGT and coolant-related operating conditions, and it will not allow full power until the truck reaches 120 degrees. That warm-up safeguard is intended to prevent aggressive fueling before the engine is at a suitable operating temperature. The overall goal is to keep both the L5P engine and the Allison transmission healthy over the long term while still delivering stronger performance.
Installation is described as straightforward. The tuner connects to two sensors under the hood, then the cable is routed through the firewall and connected to the OBD-II port inside the cab. Because of that layout, the job is mostly a matter of making the required plug-in connections and routing the harness cleanly.
The presenter estimates that a first-time installer would likely need about 45 minutes to an hour, depending on mechanical experience. They note that they had already installed a couple of these units for customers, which reinforced the impression that the process is relatively easy and not especially intimidating for someone comfortable working on the truck.
After installation, the recommended setup procedure was followed rather than immediately selecting the highest tune. According to the manual, the user should step through the tuning levels progressively. The presenter describes starting at the lower settings, moving through the intermediate tune, and then advancing to the highest level. That staged approach appears to be part of the intended calibration process and was followed as instructed before evaluating full performance.
Once the truck was running on the highest tune, the improvement in performance was obvious. The presenter says the truck definitely feels stronger than it did in stock form. Although there is the familiar enthusiast sentiment that more power is always welcome, the overall conclusion is that the tuner delivers a noticeable gain and improves the truck's responsiveness in a meaningful way.
The final takeaway is that, among the products currently available for this application, the Banks Derringer stood out because it combined the strongest dyno-proven power increase with operating safeguards aimed at protecting the engine and Allison transmission. For someone shopping the market with horsepower as the top priority but still wanting reliability and safety controls, that combination is presented as the reason this tuner was chosen.