🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Trim Level: WRX STI Codes Engine Code: EJ257 Chassis Code: GDB 👋 Introduction Market Position Positioning: Performance-oriented compact sedan/wagon, rally homologation special Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Subaru WRX (non-STI) Key Features Performance Focus: Symmetrical All-Wheel Drive, turbocharged boxer engine, performance tuning, rally heritage 📋 Manual Details Coverage Areas Coverage Scope: Bumper-to-bumper comprehensive repair and maintenance Special Features: Includes detailed wiring diagrams, exploded views, and troubleshooting flowcharts Page Count Estimated Pages: Approximately 1500+ Manual Type Type: OEM Service and Repair Manual Language Language: English Format Format: PDF - Downloadable 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel, ignition, emission control, turbocharging system Transmission: Manual transmission (TY757/TY856), clutch system, drivetrain, AWD system (DCCD) Brakes: Brake system, ABS, parking brake Suspension: Front and rear suspension, steering system Electrical: Starting and charging system, lighting, instruments, wipers, power accessories, HVAC electrical, audio system, ECU, wiring diagrams Body: Body exterior and interior, doors, windows, seats, panels, chassis Powertrain Control: Engine Control Unit (ECU) functions, sensor data interpretation, idle control Procedures Included Maintenance: Routine maintenance, tune-ups, fluid changes, filter replacements, belt inspections Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based troubleshooting Repair: Component removal, disassembly, inspection, reassembly, and installation for all major systems Specifications: Torque specifications, clearances, fluid capacities, resistance values, voltage readings Technical Depth Depth: Comprehensive, from basic service to complex engine and transmission rebuilds Diagnostics Tools: Includes procedures for using OBD-II scanners and interpreting diagnostic codes 📊 Manual Specifications File Format Compatibility: Windows (95-98-ME-XP-7), MAC, LINUX Resolution: High resolution for clarity of diagrams and text Print Quality Searchability: Likely text-searchable PDF Binding Type Binding: Not Applicable (Digital Download) Paper Type Paper Type: Not Applicable (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2.5L turbocharged DOHC flat-four (EJ257) Performance Horsepower: 300 hp @ 6000 rpm (approx.) Torque: 300 lb-ft @ 4000 rpm (approx.) Fuel System Injection Type: Sequential multi-point fuel injection (MPI) Octane Rating: Premium Unleaded (91+ Octane) Cooling System Coolant Type: Subaru Super Coolant (Blue) or equivalent Turbocharger Turbo Model: IHI VF39 Engine Code Engine Family: EJ Series Boxer 🔧 Transmission Standard Transmission Type: 6-speed manual Features Drivetrain: Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) Fluid Specifications Transmission Fluid: API GL-5, SAE 75W-90 (Hypoid gear oil) Gear Ratios 1St Gear: 3.167:1 2Nd Gear: 2.000:1 3Rd Gear: 1.367:1 4Th Gear: 1.000:1 5Th Gear: 0.757:1 6Th Gear: 0.533:1 📐 Dimensions Exterior Length: 173.8 inches Width: 69.7 inches Height: 56.1 inches Weights Curb Weight: 3263 lbs Wheelbase: 104.0 inches 🛡️ Safety Features Ratings NHTSA Front Impact: 5 Stars NHTSA Side Impact: 5 Stars Passive Features Airbags: Front dual-stage airbags, front side-impact airbags Active Features ABS: Anti-lock Braking System (ABS) Traction Control: Yes (often driver-selectable modes via DCCD) 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD player, often with premium sound options Driver Assistance Active Aids: ABS, AWD with DCCD Connectivity Connectivity Features: Limited by 2004 standards; primarily focused on vehicle performance and control 🔧 Maintenance Service Intervals Oil Change: Every 3,750 miles or 3 months (severe driving), 7,500 miles or 6 months (normal driving) Air Filter Replacement: Every 15,000 miles or 12 months Spark Plug Replacement: Every 60,000 miles Timing Belt Replacement: Not Applicable (Timing Chain) Fluid Specifications Engine Oil: SAE 5W-30 (API SN or newer, synthetic recommended for performance) Coolant Capacity: Approximately 7.0 quarts (3.3 liters) Brake Fluid: DOT 3 or DOT 4 Differential Fluid Front: API GL-5, SAE 75W-90 Differential Fluid Rear: API GL-5, SAE 75W-90 (Hypoid gear oil with limited slip additive if applicable) Known Issues Engine Component: Head gasket failures (can occur with high mileage or abuse), turbocharger failures (especially oil starvation), ringland failure on pistons Suspension Component: Worn control arm bushings, premature strut failure Drivetrain Component: Clutch wear (performance driving), differential issues 📚 Vehicle History Brand Heritage Heritage Focus: Motorsport, rally racing, turbocharged performance Model Evolution Generation: Second Generation (GD) Production Manufacturing Location: Gunma Plant, Japan 🏆 Awards & Recognition Recognitions Motorsport Legacy: Strong presence and success in WRC and other global rally championships