Banks Power 17-19 Chevrolet/GMC 2500/3500 6.6L Gen 2 Diesel Derringer Tuner (Req iDash)Results in torque and power gains across the full operating rpm range, starting right off idle and marching to the shift point in each gear. Derringer is dyno calibrated to use multiple data inputs such as throttle position, rpm, vehicle speed, AFR, knock, coolant temperature, and EGT, just like your engine's ECM. It actively and safely optimizes calibrations in real time thanks to its OBD II connectivity. No competitive tuner does that. Derringer has