🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX & STI Generation: Third Generation (GE/GH/GR/GV) Model Years Covered: 2008-2010 Codes Chassis Codes: GE (Sedan), GH (Hatchback), GR (Hatchback/Wagon), GV (Sedan) Engine Codes: EJ255 (WRX), EJ257 (STI) 👋 Introduction Market Position Positioning: The 2008-2010 Impreza WRX and STI represented Subaru's high-performance rally-inspired compact car, known for its turbocharged boxer engines, Symmetrical All-Wheel Drive, and agile handling. This manual targets owners and enthusiasts seeking to maintain and repair these capable vehicles. Competitive Analysis Competitors: Competed against vehicles like the Mitsubishi Lancer Evolution, Volkswagen GTI, Mazdaspeed3, and Ford Focus RS in its segment. Key Features Manual Value: Provides factory-level repair and maintenance information, empowering owners to perform complex tasks, saving significantly on dealership service costs. Includes critical technical service bulletins and diagnostic data. 📋 Manual Details Coverage Areas Primary Coverage: 2008-2010 Subaru Impreza WRX & STI Secondary Coverage: Standard Impreza models (specific sections) Page Count Estimated Page Count: Detailed sections suggest extensive coverage, likely exceeding 2000 pages in a comprehensive digital format. Manual Type Type: Factory Workshop Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Includes both naturally aspirated (H4SO) and turbocharged (H4DOTC for WRX, STI Engine for STI) boxer engines. Detailed diagnostics, repair procedures, and component specifications. Transmission: Covers manual and potentially automatic transmissions specific to WRX and STI models, including clutch systems, gearbox internals, and driveline components. Chassis: Comprehensive coverage of suspension (front and rear), steering, brakes (including performance braking systems for STI), wheel alignment, and chassis components. Body: Interior and exterior trim, doors, windows, seats, HVAC system, lighting, and body panel repair and replacement procedures. Electrical: Extensive wiring diagrams, electrical component locations, diagnostic procedures for ECUs, sensors, actuators, lighting, infotainment, and power distribution. Body Repair: Detailed procedures for structural repair, panel replacement, dent removal, and rust prevention, crucial for performance vehicles. Procedures Included Maintenance: Routine maintenance schedules, fluid changes (oil, coolant, brake fluid, transmission fluid), filter replacements, and inspection procedures. Diagnostics: Troubleshooting guides for common symptoms, DTC (Diagnostic Trouble Code) interpretation, and step-by-step diagnostic processes for all major systems. Repair: In-depth repair instructions for component removal, disassembly, reassembly, and installation, covering everything from engine internals to body panels. Installation: Guides for accessory installation and specific technical training for technicians. Technical Depth Depth: Comprehensive factory-level detail suitable for professional technicians and advanced DIY enthusiasts. Covers everything from basic adjustments to full engine and transmission rebuilds. Diagnostic Tools: Includes information relevant to On Board Diagnostics II (OBD-II) and potential use of Subaru Select Monitor (SSM) or equivalent diagnostic tools. 📊 Manual Specifications File Format Quality: High quality diagrams and instructions, implies crisp text and clear imagery. Likely searchable PDF text for easy navigation. Print Quality Printability: All pages are printable, allowing users to create physical copies for use in the workshop or garage. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) Compatibility Operating Systems: Compatible with All Versions of Windows & Mac Requirements Software Requirements: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Wrx Engine: 2.5L turbocharged Boxer 4-cylinder (EJ255) Sti Engine: 2.5L turbocharged Boxer 4-cylinder with specific STI enhancements (EJ257), often featuring a twin-scroll turbocharger and stronger internals. Performance Wrx Horsepower: Approximately 265 hp (varies slightly by year) Wrx Torque: Approximately 244 lb-ft (varies slightly by year) Sti Horsepower: Approximately 305 hp (varies slightly by year) Sti Torque: Approximately 290 lb-ft (varies slightly by year) Fuel System Fuel Delivery: Multi-point fuel injection (MPFI) for both WRX and STI. Includes detailed information on fuel pumps, injectors, and fuel pressure regulators. 🔧 Transmission Standard Wrx Transmission: 5-speed manual transmission (early 2008 models), upgraded to 6-speed manual transmission for later 2008 and subsequent models. Sti Transmission: 6-speed manual transmission (STI exclusive) Optional Optional Transmission: While primarily manual, some Impreza models offered automatics; however, WRX and STI variants were almost exclusively manual for this generation. Features Driveline: Subaru Symmetrical All-Wheel Drive system with center differential (manual), viscous coupling, and limited-slip differentials (front and rear on STI, R180 rear diff on STI). 📐 Dimensions Exterior Body Styles: Available as a 4-door sedan (GV/GR) and 5-door hatchback (GE/GH/GR). Note: STI sedan was the primary body style for STI in North America for this generation. Weights Curb Weight Wrx: Approximately 3200-3300 lbs (varies by body style and transmission) Curb Weight Sti: Approximately 3350-3450 lbs (varies by body style) Wheelbase: 103.2 inches (2620 mm) Wheel Bolt Pattern: 5x100mm (common for Impreza models of this era) 🛡️ Safety Features Ratings NHTSA Ratings: Generally received good safety ratings, with specific results varying by model year and test. Often received 4-star or 5-star ratings in frontal and side impact tests. Active Features Active Safety: Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist, Traction Control System (TCS), Vehicle Dynamics Control (VDC). Passive Features Passive Safety: Front dual-stage airbags, front...