The 2007 MazdaSpeed 3, part of the first generation BK chassis, represents a compelling fusion of performance and practicality, engineered for enthusiasts. Building on Mazda's heritage of creating engaging driving experiences, this hot hatch features a potent 2.3-liter turbocharged MZR DISI engine delivering 263 horsepower and 280 lb-ft of torque, coupled with a precise 6-speed manual transmission and a standard limited-slip differential. Its sport-tuned suspension, powerful braking system, and aggressive styling distinguish it within the performance compact segment, offering a thrilling yet usable package for daily driving and spirited excursions. This comprehensive workshop service repair manual is designed to provide professional technicians and enthusiasts with the in-depth knowledge required for the maintenance, diagnosis, and repair of the 2007 MazdaSpeed 3. Covering all major systems from the engine mechanicals and management to the transmission, brakes, suspension, steering, and electrical systems, this manual details routine maintenance procedures, troubleshooting common issues, and complex repair operations. With approximately 2500+ pages of detailed information, including diagrams, specifications, and diagnostic flowcharts, it serves as an essential resource for ensuring the optimal performance and longevity of your vehicle.