🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2008 Chassis Code: GR/GH/GE Market Segment: Compact Sports Sedan/Hatchback 👋 Introduction Market Position Market Position: The 2008 Subaru Impreza WRX STI (GR/GH/GE chassis) represented a significant evolution, moving to a more global platform and offering increased performance, refinement, and AWD technology, solidifying its position as a premier rally-bred sports sedan/hatchback. Competitive Analysis Competitors: Competed directly with vehicles like the Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI, and similar performance-oriented compact vehicles. Key Features Performance Focus: Renowned for its turbocharged Boxer engine, Symmetrical All-Wheel Drive, and sophisticated suspension tuning, offering exceptional handling and driver engagement. Rally Heritage: Directly influenced by Subaru's successful rally racing programs, providing a road-legal performance machine. Manual Value Proposition Target Audience: Owners, DIY mechanics, performance tuners, and professional technicians seeking accurate, detailed repair and maintenance information for the 2008 WRX STI. 📋 Manual Details Coverage Areas Covered Models: All 2008 Subaru Impreza WRX STI models (all trims and engine variants) Covered Engines: All engine variants for the 2008 Impreza WRX STI Page Count Estimated Page Count: Approximately 2000+ Manual Type Manual Type: Official Service Manual / Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine disassembly, inspection, repair, reassembly, timing belt, cooling system, lubrication system Engine Performance: Engine tuning, diagnostics, emissions control systems, turbocharger system Fuel System: Fuel injection system, fuel pump, fuel injectors, fuel pressure regulator, evaporative emissions (EVAP) system Ignition System: Ignition coils, spark plugs, ignition timing control Transmission Manual: Clutch, gearbox, shift linkage, lubrication Transmission Automatic: Not applicable for STI models of this generation Drivetrain AWD: Symmetrical All-Wheel Drive system, center differential, front differential, rear differential, driveshafts, hub assemblies Suspension Front: McPherson struts, control arms, sway bar, bushings, alignment specifications Suspension Rear: Multi-link independent suspension, shock absorbers, springs, trailing arms, bushings, alignment specifications Brakes Front: Brake calipers (Brembo), brake rotors, brake pads, brake lines, ABS components Brakes Rear: Brake calipers (Brembo), brake rotors, brake pads, brake lines, ABS components Steering: Power steering system, steering column, tie rods, steering rack Electrical System: Battery, charging system (alternator), starting system, fuses, relays, wiring diagrams Lighting System: Headlights, taillights, interior lighting, fog lights, bulb replacement Climate Control: Air conditioning system, heater core, blower motor, refrigerant, cabin air filter Body Exterior: Body panels, doors, hood, trunk lid, bumpers, glass, seals, trim Body Interior: Seats, dashboard, door panels, headliner, carpeting, trim panels Safety Systems: Airbags, seat belts, SRS system diagnostics Diagnostic Troubleshooting: Diagnostic trouble codes (DTCs), troubleshooting flowcharts, component testing Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks and top-offs, tire rotation, brake inspection Engine Repair: Head gasket replacement, piston and ring replacement, crankshaft and bearing service, valve train adjustments Transmission Repair: Gearbox overhaul, clutch replacement, differential service Suspension Repair: Strut replacement, control arm bushing replacement, wheel bearing replacement, alignment adjustments Brake Repair: Brake pad and rotor replacement, caliper service, brake line replacement, brake fluid bleeding Electrical Diagnostics: Wiring harness repair, component testing, sensor diagnosis, ECU troubleshooting Climate Control Service: AC system recharge, leak detection, heater core replacement Body Work: Panel removal and installation, door adjustment, glass replacement Turbocharger Service: Turbocharger inspection, repair, and replacement, boost leak testing Diagnostics And Troubleshooting: Step-by-step diagnostic procedures for various systems, common fault identification and correction Technical Depth Technical Depth: Comprehensive from basic maintenance to complete engine and transmission rebuilds, including electrical system diagnostics and bodywork repairs. 📊 Manual Specifications File Format File Format: PDF Searchable Text: Yes Printable: Yes Print Quality Print Quality: High-resolution, clear diagrams and text Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L (2457cc) DOHC turbocharged horizontally-opposed (Boxer) 4-cylinder Performance Horsepower: 305 hp @ 6000 rpm (approx.) Torque: 290 lb-ft @ 3000 rpm (approx.) Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.2:1 Turbocharger: IHI VF48 twin-scroll turbocharger with intercooler Fuel System Fuel Delivery: Sequential multi-point fuel injection (MPI) Fuel Type: Premium Unleaded (91 octane or higher recommended) Cooling System Coolant Capacity: Approximately 8.5 liters (1.7 US qt) Lubrication System Oil Capacity: Approximately 5.8 liters (6.1 US qt) with filter Oil Type: API SG or SH, ACEA A2-96 or B2-97, SAE 5W-30 (check manual for specific recommendations) Timing Belt Timing Belt Interval: 105,000 miles or 105 months (check manual for precise interval and condition) 🔧 Transmission Standard Transmission Type: 6-speed manual transmission Transmission Fluid Capacity: Approximately 2.4 liters (2.5 US qt) for gearbox; 1.1 liters (1.1 US qt) for front differential; 1.0 liters (1.0 US qt) for rear differential (check manual for exact specifications) Transmission Fluid Type: GL-4 SAE 75W-90 for gearbox; GL-5 SAE 75W-90 for differentials (check manual for exact specifications) Features All Wheel Drive: Subaru Symmetrical All-Wheel Drive with Driver-Controlled Center Differential (DCCD) 📐 Dimensions Exterior Length: 4415...