Does a 2004 Chevy Impala SS have governor chip?

No, the 2004 Chevy Impala SS does not have a governor chip in the traditional sense. While the car's computer controls various aspects of the engine's operation, including limiting RPM in certain situations (like during engine break-in), there isn't a separate, easily accessible "governor chip" that can be replaced or modified to increase the speed limit. The speed limiter is programmed into the car's PCM (Powertrain Control Module). Modifying the speed limiter requires reprogramming the PCM, which typically involves specialized tools and software.