The 2004 Subaru Impreza WRX STI is a compact performance vehicle celebrated for its rally-bred engineering and dynamic capabilities. This generation, known for its distinctive styling and robust chassis, offers a potent combination of turbocharged boxer engines, Symmetrical All-Wheel Drive, and sport-tuned suspension systems. It competed effectively in the performance car segment, distinguishing itself with its unique drivetrain and driver-focused design, making it a highly sought-after model for enthusiasts.

This comprehensive service manual provides detailed information for the maintenance, repair, and troubleshooting of the 2004 Subaru Impreza, covering various engine variants including the STI, naturally aspirated, and turbocharged options. It encompasses major systems such as the powertrain, chassis, body, and electrical components, offering in-depth procedures for diagnostics, routine maintenance, and major overhauls. With over 1000 pages of technical data, including wiring diagrams and special tool requirements, this manual is an essential resource for owners and technicians aiming to preserve the performance and integrity of their vehicle.