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 V3-4 EJ20 Please check your connector 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: GC8D GC8E WRX and STI from 09/1996 to 08/1998 Download manual here Download full G4X specifications here.