The 2003 Ford Ranger 3.0L engine doesn't have a separate, easily identifiable "performance chip" like some later vehicles with programmable engine control units (ECUs). The engine's computer controls are integrated into the Powertrain Control Module (PCM), often called the ECM (Engine Control Module). This PCM is the equivalent of the "performance chip" in that it controls fuel delivery, ignition timing, and other parameters. However, it's not a removable chip, but a complex electronic module.
To find the PCM, you'll likely need to consult a repair manual specific to your year and model Ranger. It's usually located under the hood, often near the firewall, but the exact location can vary slightly.
