A late-model Duramax can feel soft once you add bigger wheels and tires, and that gets worse when the truck is expected to pull a heavy fifth wheel. Our fix here is a matched system: the Banks Derringer Tuner adds power under load, while Banks PedalMonster cleans up the lazy pedal response that makes a heavy truck feel harder to drive. Derringer is adjustable through six power levels and works through OBD data, so power is managed in real time instead of being dumped in blindly. PedalMonster lets you choose the response curve you want, but it also knows when the truck is in reverse and returns to stock throttle behavior for backing control. Tie it together with iDash and you can adjust both devices, watch calculated engine data your factory dash does not show, run diagnostics, and set alerts for critical temperatures and pressures. The result is a Duramax that feels more responsive empty, more confident under load, and easier to tow with.
Steve from Lake Arrowhead brought in a 2021 Chevrolet 2500 HD that will be used to tow a 40-foot, 18,000-pound fifth-wheel trailer. When he picked the truck up from Banks, the vehicle had already received a full set of Banks upgrades, including the Derringer, PedalMonster, Monster Exhaust, and a differential cover. The walkaround focused on reviewing the installed hardware and then demonstrating how the electronic systems work together in the truck.
The first exterior item highlighted was the Monster Exhaust. Steve immediately noticed its large size and the black finish, which matched the truck well. The presentation treated it as part of a complete towing-oriented package rather than as a standalone cosmetic change, fitting with the broader goal of preparing the 2500 HD for heavy trailer duty.
Under the hood, Banks pointed out the Derringer module, describing it as the component responsible for adding horsepower. The installation was presented as clean and professional, with the expectation that its effect would be most noticeable once the truck was driven under load. During the later road test, Banks explained that the Derringer adds power only at roughly 35 percent throttle and above. That means normal light-throttle driving around town does not automatically use extra fuel, while additional power becomes available when the driver asks for it.
Inside the cab, one of the notable additions was the new iDash Stealth Pod. Steve was told he was among the first customers to receive this dual-pod setup. The design addresses requests from owners who wanted to keep the factory grab handle while still mounting gauges cleanly. Banks calls it a stealth pod because the wiring is hidden rather than hanging visibly in the cabin. The wires are routed down and under the dash, connecting the in-cab controls to the PedalMonster and ultimately to the Derringer under the hood. The result was described as a professional-looking installation with no exposed wiring clutter.
The iDash display was configured so the left side represented PedalMonster status and the right side represented Derringer status. On the PedalMonster side, the driver can change throttle sensitivity by stepping through modes such as City, Sport, and Track. During the demonstration, the display used a bar-graph style indication in which the white portion represented the driver's throttle command and the red portion showed what the system was adding. Banks noted that the difference becomes more obvious on the road when the engine is under real load.
On the Derringer side, the display initially showed stock mode. By pressing the back button to highlight that side of the screen and then using the up arrow, the driver could move through increasing power levels up to level 6, which was described as the maximum horsepower setting. The center of the display contained three configurable gauges, and there was another configurable gauge at the top. Additional pages could be accessed by holding the control, revealing multiple screen layouts and gauge pages. The system also allowed different gauge-count layouts, ranging from two gauges up to eight gauges on screen.
Banks emphasized that the iDash is not limited to the parameters shown by the factory dashboard. Connected through OBD plus LBP2, it can display both direct and calculated values in real time. Examples mentioned included manifold air density, boost air density, and a variety of turbo-related parameters that the stock instrument cluster does not provide.
The menu structure also supports extensive customization. Users can choose different display themes and layouts, assign different parameters to each gauge position, and change gauge colors. The system was presented as a flexible monitoring tool rather than just a simple power-adder interface, giving the driver access to a much broader set of engine and vehicle information.
For the driving demonstration, the truck started with both PedalMonster and Derringer shown in stock. Steve was instructed to highlight the Derringer side of the screen and raise it to level 6 before heading around the block. As soon as he accelerated, he commented that he could already hear the pitch change. When he gave the truck more throttle, the response was immediate and strong enough that he described it as almost disconcerting at first, simply because it was such a noticeable change from stock behavior.
Banks pointed out that at this stage the PedalMonster had not yet been adjusted, so the truck was still using stock throttle sensitivity. Even so, Steve's reaction made clear that the added power from the Derringer substantially changed how the truck felt. Banks also directed attention to the bar graph on the display, which showed the added power activity while the truck was accelerating.
After demonstrating the Derringer alone, Banks moved to the PedalMonster settings. Starting from stock, Steve increased the left-side setting into City mode, eventually reaching City 8. He immediately noticed that the same engine now responded much more quickly to pedal input. His comment was that the truck already had plenty of power, but getting it to respond this sharply had previously been a challenge. The change was not about creating a different engine, but about changing how directly the truck reacted to the driver's foot.
Banks then demonstrated one of PedalMonster's gear-aware features. When the truck was shifted into reverse, the display switched to Reverse Mode and the throttle sensitivity returned to stock behavior. Banks explained that this is intended to keep backing maneuvers controlled, especially when reversing a trailer, so the truck does not become overly sensitive in reverse. As soon as the transmission was put back into drive, the system automatically returned to the previously selected City 8 setting. From there, Steve increased the setting further into Sport mode, where the combined effect of sharper pedal response and added power delivery was described as especially impressive.
The final part of the demonstration focused on the iDash menu system and its diagnostic capabilities. Using the main menu, Banks navigated into Diagnostics and then Vehicle functions. From there, the system could check vehicle codes, recall previous codes, clear vehicle codes, check emissions readiness, view injector balance rates, command a stationary regen, command a mobile regen, and reset the air filter system. During the demonstration, a code check was performed and the result came back with no codes found.
Banks also showed how the iDash can be used to configure alerts and data logging. A user can set an alert for a parameter such as transmission oil temperature and define a threshold, for example 240 degrees, at which point the display will issue a large amber warning. Importantly, the driver does not need to be actively viewing that parameter for the alert to work; the system can monitor it in the background. Minimum and maximum logging is also available, allowing the unit to record values such as lowest oil pressure, highest oil pressure, peak boost, or highest vehicle speed reached.
To illustrate the depth of available data, Banks scrolled through the parameter categories, which included air density, Derringer, diagnostics, emissions, engine performance, air fuel, pressure, speed and velocity, temperature, transmission, voltage, and vehicle performance. Within the pressure category alone, the list included boost pressure, DPF delta pressure, engine oil pressure, FRP command, fuel oil pressure, lift pump pressure, commanded manifold absolute pressure, pressure ratio, system transmission line pressure, and many more.
The conclusion of the walkthrough was that the iDash serves as a powerful monitoring and diagnostic platform for diesel owners and, more broadly, for many vehicles on the road. In this truck, it tied together the Derringer and PedalMonster controls while also giving the driver access to a level of live data, alerts, and service functions far beyond what the factory dashboard provides.