Stage 2 AI Performance Chip Module OBD2 for Peterbilt – Adaptive Power & Fuel Efficiency"Class Pays" But Power Pays Better Owning a Peterbilt is a statement. It says you don't compromise. Whether you are behind the wheel of the iconic long nose Model 389, maximizing efficiency in a 579, or hauling heavy in a 567, you are driving the "Pride and Class" of the industry. However, modern factory ECU calibrations are designed for large fleets with inexperienced drivers, restricting the engine's true potential to ensure "safe" averages. This