The 2008 Subaru Impreza WRX STI, chassis code GE/GH, represents a potent iteration of Subaru's rally-bred performance sedan. Building on a rich World Rally Championship heritage, this model features a turbocharged 2.5-liter EJ257 Boxer engine producing 305 horsepower and 290 lb-ft of torque, paired with a 6-speed manual transmission and Subaru's Symmetrical All-Wheel Drive system, complete with Driver Controlled Center Differential (DCCD) for enhanced traction and handling. Its engineering emphasizes performance, with a focus on dynamic handling, strong braking capabilities, and a practical yet sporty design. This vehicle was positioned as a top-tier sports compact, competing with other performance-oriented vehicles of its era.

This comprehensive factory service repair manual provides in-depth information for the 2008 Subaru Impreza WRX STI and related WRX models. It covers all essential systems, including detailed procedures for powertrain maintenance and repair, transmission specifics, chassis and suspension adjustments, bodywork, and electrical diagnostics. The manual includes scheduled maintenance guidelines, troubleshooting steps for common issues, repair procedures for all major components, and installation instructions. Its extensive coverage aims to assist owners, mechanics, and technicians in maintaining, diagnosing, and repairing the vehicle effectively, ensuring optimal performance and longevity.