This comprehensive Subaru Impreza WRX STI Service Workshop Manual provides in-depth technical information for the 2005 model year. It covers all major systems including the STI engine, both H4SO and H4DOTC variants, transmission, chassis, body, and wiring system. This manual is an invaluable resource for mechanics, technicians, and serious DIY enthusiasts looking to perform repairs, maintenance, or modifications on their Subaru Impreza WRX STI. Each section includes detailed diagrams, illustrations, and step-by-step instructions to guide users through every procedure.

The Subaru Impreza WRX STI, a high-performance variant of the Impreza, has carved a legendary reputation in the automotive world, particularly among car enthusiasts seeking raw performance and handling prowess. The 2005 model year marked a significant milestone for the WRX STI, as it introduced the iconic EJ255 engine, an evolution of the EJ257 found in earlier models. This 2.5-liter turbocharged boxer engine boasted an increase in displacement and a revised turbocharger, delivering an impressive 300 horsepower and 300 lb-ft of torque. Coupled with a robust 6-speed manual transmission and a sophisticated all-wheel-drive system, the WRX STI offered a thrilling driving experience, capable of both blistering acceleration and exceptional handling around corners. Beyond the powertrain, the 2005 WRX STI showcased meticulous attention to detail in its design and engineering. The suspension received a comprehensive overhaul, featuring stiffer spring rates and dampers, along with larger brakes to handle the increased performance. The bodywork was also refined with a more aggressive aerodynamic design, including a larger rear wing and a front splitter, contributing to better downforce and handling stability at high speeds. The interior was equally focused on functionality and driver engagement, with heavily bolstered Recaro seats providing excellent support during spirited driving and a driver-centric cockpit with clear instrumentation. The Subaru Impreza WRX STI, with its potent engine, precise handling, and purposeful design, established itself as a true icon of performance and an enduring symbol of Subaru's commitment to delivering a rewarding driving experience.