This manual covers the 2006 Subaru Impreza WRX STI, chassis code GDB, equipped with the EJ257 turbocharged engine. Known for its rally heritage and performance-oriented design, the WRX STI offers a potent combination of a 2.5L flat-four turbocharged engine producing approximately 320 horsepower and 330 lb-ft of torque, Symmetrical All-Wheel Drive with a Driver Controlled Centre Differential (DCCD), and a 6-speed manual transmission. This model, representing the 'Hawkeye' refresh of its generation, was engineered for enthusiasts seeking exceptional handling and driving dynamics, making it a standout in the performance compact car segment.

This comprehensive Factory Service Workshop Repair Manual provides detailed information essential for maintaining and repairing your 2006 Subaru Impreza WRX STI. It covers critical systems including the engine (EJ257 and related variants), transmission, chassis, body, and electrical systems. Within its 1500+ pages, you will find step-by-step procedures for scheduled maintenance, diagnostics, and repairs, along with technical specifications, torque values, and wiring diagrams. This resource is invaluable for owners and technicians alike, ensuring the optimal performance, reliability, and longevity of this iconic performance vehicle.