It is a Piggy Back computer and can fit various cars. Was on a WRX 2000.
Example of Unichip:
The Nissan GTR really comes to life with optimized boost, fuel and ignition tuning.
The Unichip not only enhances power and torque across all throttle positions throughout the entire rev range, but significantly enhances throttle response, driveability, fuel economy and outright acceleration.