The 2005 Subaru Impreza WRX STI, chassis code GDB, represents a pinnacle of performance engineering, building upon Subaru's rich rally heritage. Equipped with the potent EJ257 turbocharged boxer engine producing 320 horsepower and 315 lb-ft of torque, paired with a precise 6-speed manual transmission and Subaru's legendary Symmetrical All-Wheel Drive system featuring the Driver Controlled Center Differential (DCCD), this vehicle offers exceptional traction and dynamic handling. Its performance-tuned suspension, high-performance Brembo brakes, and aggressive aerodynamic components underscore its rally-bred DNA, making it a formidable machine for both spirited driving and track use.

This comprehensive service workshop repair manual provides in-depth guidance for the maintenance, repair, and diagnosis of the 2005 Subaru Impreza WRX STI. It covers all essential systems, including detailed procedures for the STI, H4SO, and H4DOTC engines, transmission, chassis, body, and electrical systems. Within its extensive pages, owners and technicians will find routine maintenance schedules, diagnostic troubleshooting guides, component removal and installation instructions, engine and transmission rebuild procedures, and critical torque specifications. The manual is designed to empower users with the knowledge needed to keep this high-performance vehicle in optimal condition, ensuring its reliability and performance.