This manual covers the Subaru Impreza WRX STI, model year 2004, chassis code GDB, equipped with the EJ207 2.0L Turbocharged Boxer engine. Known for its strong World Rally Championship heritage and performance-focused engineering, this model is celebrated for its Symmetrical All-Wheel Drive system with a Driver Controlled Center Differential (DCCD), front Brembo brakes, and a 6-speed manual transmission. It represents a significant entry in the performance compact segment, appealing to enthusiasts and those who appreciate rally-bred capabilities.

This comprehensive factory service manual provides detailed information essential for the maintenance, repair, and diagnosis of your 2004 Subaru Impreza WRX STI. It includes extensive coverage of all major systems, from engine overhaul and transmission service to suspension, brakes, and electrical systems. Within its estimated 1500+ pages, you will find diagnostic procedures, repair instructions, maintenance schedules, troubleshooting guides, and wiring diagrams, all designed to assist owners, mechanics, and technicians in keeping this iconic vehicle in optimal condition.