The B2 ECU 22611AJ820 is a front-placed Engine Control Unit (ECU) for Subaru Impreza GDA GDB WRX STI models from 2001 to 2007. It features a bolt-on mounting style with pin terminals and logic output connection. Manufactured by Subaru in Japan, this steel ECU has an analog input connection and comes with a 1-month manufacturer warranty for easy installation. This part weighs 1 lb and is designed for specific Subaru models, making it a non-vintage, non-universal fitment component.