This manual covers the 2007 Subaru Impreza STI, a performance-oriented compact sedan and wagon renowned for its rally-inspired all-wheel-drive capabilities. Powered by horizontally-opposed, turbocharged boxer engines (EJ257, engine code H4DOTC) producing approximately 305 horsepower, and featuring a 6-speed manual transmission with a Driver Controlled Center Differential (DCCD), the STI offers exceptional handling and performance. Its engineering emphasizes a robust chassis, sport-tuned suspension, and upgraded braking systems, making it a distinctive choice in its market segment.

This comprehensive Factory Service Workshop Repair Manual provides detailed guidance for the maintenance, diagnosis, and repair of the 2007 Subaru Impreza STI. It covers all major systems, including the engine (H4SO, H4DOTC), transmission, chassis, body, and electrical systems. Procedures range from routine maintenance tasks like oil changes and filter replacements to in-depth engine and transmission overhauls, brake system repairs, and electrical troubleshooting. This manual is an essential resource for owners, technicians, and mechanics seeking to ensure the optimal performance, reliability, and longevity of their vehicle.