Syvecs ECU - Plug-in ECU Package for the GR Yaris - Standalone ECUSyvecs ECU Plug in ECU Package for the GR Yaris Standalone ECU A full direct fit ECU Kit without compromise No cutting of factory wires or routing of cables into cabin needed. The Syvecs Toyota Yaris GR Kit kit brings a new level of engine management control to the Toyota GR Yaris. Designed to work for a factory car to the highest level of motorsport, the Syvecs plug in ecu offers the following to the platform: Live tuning of every aspect of the