The 2006 Subaru Impreza WRX STi, a model deeply rooted in rally heritage, represents a pinnacle of performance engineering for its era. This generation, code-named GDB, was celebrated for its iconic Symmetrical All-Wheel Drive system, potent 300 horsepower 2.5L turbocharged EJ257 Boxer engine, and advanced Driver Controlled Center Differential (DCCD). Engineered for both exhilarating driving dynamics on demanding roads and everyday practicality, the WRX STi offered a unique blend of raw performance, sharp handling, and robust construction, making it a standout in the sport compact market.

This comprehensive factory service manual provides essential information for the maintenance, repair, and diagnosis of the 2006 Subaru Impreza WRX STi. Covering approximately 2500+ pages in English, it details critical systems including the 2.5L EJ257 engine, 6-speed manual transmission, advanced braking and suspension systems, and intricate electrical components. The manual offers step-by-step procedures for routine maintenance, in-depth troubleshooting guides, detailed technical specifications, and essential safety guidelines, serving as an indispensable resource for owners and technicians alike to ensure optimal performance and longevity.