This was used on a 2017- 2019 Chev Silverado Duramax L5P engine. The Banks Power Derringer Tuner is a highly advanced, plug-and-play inline performance tuner designed to safely unlock massive horsepower and torque gains across your diesel or gas truck's entire RPM range. Unlike standard "dumb" tuning boxes that simply intercept sensor signals, the Derringer connects directly to your vehicle's OBD-II diagnostic port. This allows it to actively communicate with the factory Engine Control Module (ECM) to execute intelligent, real-time power adjustments 250 times per second.