Easy to install. Affordable. Reliable.   G4X PlugIn ECUs offer the latest in engine management technology, designed to easily maximize the potential from your car.   This ECU fits inside the factory OEM enclosure. Installation is a breeze, with no alteration of the factory wiring loom required for the models listed below.  Designed for the WRX V1-2 EJ20.  Please check your pinoutconnector matches the header in the listed photo before purchasing.   This ECU works for manual transmissions only.   Air temp sensor highly recommended.  Most factory features are supported.  Check the features tab for I/O expansion options. This ECU will need a modification before E-Throttle is usable. Suitable Applications:  GC8A  GC8B  GC8C  WRX and STI from 10/1992 to 8/1996  Download manual here Download full G4X specifications here.