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 3SGTE engine in the models specified below.  Please check your connector matches the header in the listed photo before purchasing.   This ECU works for manual transmissions only.   A Link Air Temp Sensor is highly recommended with this ECU  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:  Toyota MR2 (SW20) from 1989 to 1992  Toyota Celica ST185 (except the GT-Four RC/Carlos Sainz Special Edition which is compatible with the Link TST205X Plugin) Download manual here Download full specification PDF here