This comprehensive workshop service repair manual provides detailed instructions and specifications for the 2003 and 2004 Subaru Impreza STI. It covers a wide range of topics, from basic maintenance procedures to complex engine and transmission repairs. The manual includes step-by-step instructions, illustrations, wiring diagrams, and troubleshooting tips, making it an essential resource for both professional mechanics and DIY enthusiasts. You'll find detailed information on engine, transmission, suspension, brakes, electrical systems, and more. With its complete and accurate information, this manual equips you with the knowledge and guidance to confidently diagnose, maintain, and repair your Subaru Impreza STI.

The 2003 and 2004 Subaru Impreza WRX STI, a performance variant of the iconic Impreza, marked a significant evolution in the model's legacy. These years saw the introduction of the iconic "Bugeye" styling, characterized by its distinctive, rounded headlights and aggressive front fascia. Underneath the skin, the STI boasted a potent 2.5-liter turbocharged boxer engine, generating a thrilling 300 horsepower and 300 lb-ft of torque, making it a serious contender in the performance car market. This power was channeled through a robust 5-speed manual transmission, delivering exhilarating acceleration and a raspy, distinctive exhaust note. The STI's performance was further enhanced by its advanced symmetrical all-wheel-drive system, providing exceptional traction and handling, enabling drivers to conquer corners with confidence. The car also featured a sophisticated suspension system, with adjustable dampers and a reinforced chassis, making it incredibly capable on both the track and the road. The 2003 and 2004 Subaru Impreza WRX STI became renowned for its exceptional handling, raw power, and distinct character. Inside, the cabin was functional and driver-focused, featuring supportive sport seats, a leather-wrapped steering wheel, and a straightforward instrument panel. While not luxurious, the interior provided everything needed for an enjoyable and engaging driving experience. The STI's reputation for reliability, combined with its affordability and performance, made it a popular choice for enthusiasts and everyday drivers alike. These two model years marked a high point in the STI's history, solidifying its place as a legendary performance car and a true icon of the Subaru brand. The "Bugeye" era of the Impreza WRX STI is fondly remembered for its raw power, capable handling, and unique styling, making it a sought-after collectible for enthusiasts today.