🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2008 Codes Chassis Code: GE/GH Engine Code Standard: EJ255 (WRX, H4DOTC - Turbocharged) Engine Code Sti: EJ257 (WRX STI, H4DOTC - Turbocharged, EJ25 Twin-Scroll Turbo) 👋 Introduction Market Position Positioning: The 2008 Subaru Impreza WRX STI represented the pinnacle of Subaru's rally-bred performance sedans, positioned as a highly capable all-wheel-drive sports compact with a strong enthusiast following. It competed against rivals like the Mitsubishi Lancer Evolution, Mitsubishi Eclipse GT, and Volkswagen Golf GTI. Competitive Analysis Strengths: Symmetrical All-Wheel Drive system, potent turbocharged Boxer engine, excellent handling dynamics, strong braking performance (especially with Brembos on STI), practical sedan body style. Weaknesses: Interior materials could be improved, fuel economy is not a strong suit, ride can be firm for some drivers. Key Features Performance Focus: Tuned EJ257 engine, DCCD (Driver Controlled Center Differential), performance-oriented suspension tuning, aggressive aerodynamic enhancements. Rally Heritage: Direct lineage from Subaru's WRC championship heritage, influencing its mechanical layout and performance characteristics. 📋 Manual Details Coverage Areas Primary Coverage: 2008 Subaru Impreza WRX STI Secondary Coverage: Includes details for both the standard Impreza WRX (with H4SO - non-turbo and H4DOTC - turbo engines) and the dedicated WRX STI variants, covering specific STI engine and transmission configurations. Page Count Estimated Page Count: Likely over 1000 pages (typical for a comprehensive factory service manual) Manual Type Type: Factory Service Repair Manual Language Language: English Format File Format: PDF Delivery Format: ZIP Archive Compatibility Operating Systems: Mac, Windows 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical (including EJ255 and EJ257 specifics), fuel system, ignition system, exhaust system, cooling system, lubrication system, turbocharger systems (including twin-scroll for STI). Transmission: Manual transmission (TY757V for STI, TY757/TY856 for WRX), clutch system, driveshafts, differentials (front, center DCCD, rear). Chassis: Suspension (front MacPherson struts, rear double wishbone/multi-link), steering system (power steering), braking system (ABS, front Brembo calipers for STI), wheels and tires. Body: Exterior body panels, interior trim, doors, windows, seats, HVAC system, SRS airbag system. Electrical: Wiring diagrams, lighting, instrumentation, audio system, power accessories, engine control module (ECM), body control module (BCM), CAN bus communication. Body Repair: Structural repair, panel replacement, collision damage assessment, corrosion protection. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections. Troubleshooting: Diagnostic procedures for engine, transmission, electrical, and chassis faults; DTC (Diagnostic Trouble Code) interpretation and resolution. Repair: Step-by-step repair procedures for all major mechanical and electrical components, including engine rebuilds, transmission overhauls, brake caliper replacement, suspension component replacement, and wiring harness repair. Installation: Procedures for installing new parts and components, including torque specifications and alignment procedures. Technical Depth Depth: Comprehensive, covering everything from basic inspections and fluid changes to complete engine and transmission disassembly/reassembly, electrical system diagnostics, and body repair. Diagnostic Tools: Information on using Subaru's specific diagnostic tools and scan data for accurate troubleshooting. 📊 Manual Specifications File Format PDF Quality: High-resolution, searchable text for easy navigation and printing. Printable: Yes, pages are designed for printing. Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally-opposed (Boxer) 4-cylinder, turbocharged, intercooled Engine Code Sti: EJ257 Displacement Sti: 2.5 Liters (2457 cc) Bore X Stroke Sti: 99.5 mm x 79.0 mm Compression Ratio Sti: 8.2:1 Horsepower Sti: 305 hp @ 6000 rpm Torque Sti: 290 lb-ft @ 4000 rpm Turbocharger Sti: Twin-scroll IHI VF48 turbocharger Performance Engine Code Wrx: EJ255 Displacement Wrx: 2.5 Liters (2457 cc) Horsepower Wrx: 265 hp @ 5200 rpm Torque Wrx: 244 lb-ft @ 2800 rpm Turbocharger Wrx: Single-scroll IHI VF52 turbocharger Fuel System Fuel Delivery: Sequential multi-point fuel injection Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) 🔧 Transmission Standard Transmission Type Sti: 6-speed manual transmission Transmission Code Sti: TY757V Transmission Type Wrx: 5-speed manual transmission Transmission Code Wrx: TY757 or TY856 Optional Optional Transmission: None (Manual transmission only for WRX and WRX STI models in this year) Features Dccd: Driver Controlled Center Differential (DCCD) with automatic and manual modes on STI models. All Wheel Drive: Subaru Symmetrical All-Wheel Drive system with front helical limited-slip differential, rear viscous limited-slip differential, and center viscous coupling (or DCCD on STI). 📐 Dimensions Exterior Length: 174.6 inches (4435 mm) Width: 70.7 inches (1795 mm) Height: 57.7 inches (1465 mm) Wheelbase: 103.0 inches (2615 mm) Weights Curb Weight Sti: Approx. 3375 lbs (1531 kg) Curb Weight Wrx: Approx. 3219 lbs (1460 kg) Cargo Trunk Volume: Approx. 11.3 cubic feet (0.32 cubic meters) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star Driver and Passenger NHTSA Side Impact: 5-Star Front and Rear Passengers IIHS Crash Test Results: 'Good' in frontal offset and side impact tests (for similar models/years, specific 2008 STI data may vary) Active Features ABS: Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD) Traction Control: Traction...