Stage 3 AI OBD2 Performance Chip for Peterbilt | Plug-and-Play Engine Tuning Module +40 HP / +45 TQMaximize the "Class" & Efficiency of Your Peterbilt You drive the best truck on the road. Its time it performed like it. A Peterbilt isn't just a truck; it's a statement. Whether you are running a long nose 389, an aerodynamic 579, or a vocational 567, you take pride in your rig. But even the "Class of the Industry" suffers from factory tuning designed for fleet averages rather than owner operator performance. This leaves you downshifting too often on