Banks Power 17-19 Chevrolet/GMC 2500/3500 6.6L Gen 2 Diesel Derringer Tuner (Req iDash)Derringer adds more torque and horsepower throughout the powerband than the competition safely and reliably letting you pull the grade without downshifting. Step up to some serious reliable and dependable power day in and day out, with the Banks Derringer; Adds up to 61 hp and 112 lb ft; Each level adds over 10 hp and 18 lb ft each; 6 power levels can be changed on the fly with the iDash; AutoRate will tune in realtime using vehicle diagnostics;