🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Codes Chassis Code: GDB Engine Code Primary: EJ207 👋 Introduction Market Position Market Position: The 2004 Subaru Impreza WRX STI (GDB chassis, Blobeye generation) represented the pinnacle of Subaru's rally-bred performance for its era, targeting enthusiasts seeking high-performance all-wheel-drive capability and a direct connection to motorsports heritage. It competed against other performance sedans and hot hatches, often favored for its unique turbocharged boxer engine and legendary Symmetrical All-Wheel Drive system. Competitive Analysis Competitors: Mitsubishi Lancer Evolution (VIII), Ford Focus RS, Volkswagen Golf GTI (performance variants of the era) Key Features Key Features: EJ207 2.0L turbocharged boxer engine, Subaru's Symmetrical All-Wheel Drive, DCCD, performance suspension tuning, distinctive 'STI' badging and aerodynamic enhancements. 📋 Manual Details Coverage Areas Areas Covered: Engine, Drivetrain, Suspension, Steering, Brakes, Electrical Systems, Bodywork, HVAC, Fuel System, Exhaust System, HVAC, SRS Airbags, Security Systems, Emission Control Systems, Diagnostics, Troubleshooting Page Count Page Count: Approx. 2500-3000 pages (estimated for a comprehensive factory service manual) Manual Type Manual Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, torque specifications, cylinder head, pistons, crankshaft, camshafts, timing belt/chain, lubrication system, cooling system, intake manifold, exhaust manifold, turbocharger systems Engine Management: ECU operation, fuel injection system, ignition system, sensor diagnostics, emission control systems, DTC troubleshooting Drivetrain: Manual transmission (6-speed), clutch system, viscous center differential, DCCD (Driver's Control Center Differential), front and rear differentials, driveshafts, wheel bearings Suspension And Steering: Front struts, rear shock absorbers, control arms, anti-roll bars, power steering system, steering rack, alignment specifications Brakes: Front and rear disc brakes, ABS (Anti-lock Braking System), brake caliper service, brake fluid specifications, master cylinder, parking brake Electrical Systems: Battery, charging system, starter motor, lighting systems, power windows, power locks, central locking, SRS airbag system, fuse box diagrams, wiring diagrams, body control module (BCM) Body And Interior: Body panel removal and installation, interior trim, seats, dashboard, door panels, glass replacement, weatherstripping HVAC: Air conditioning system, heater core, blower motor, refrigerant types, troubleshooting Procedures Included Maintenance: Scheduled maintenance intervals, oil changes, filter replacements, spark plug replacement, brake fluid flush, coolant flush, differential fluid changes, transmission fluid changes Repair: Complete engine rebuild procedures, transmission overhaul, turbocharger replacement, suspension component replacement, brake system repair, electrical component diagnosis and replacement Troubleshooting: Diagnostic flowcharts, symptom-based troubleshooting for engine, transmission, electrical, and HVAC issues, wiring diagram interpretation Diagnostics: OBD-II diagnostic trouble codes (DTCs), sensor data interpretation, scan tool usage, component testing Technical Depth Depth: Comprehensive, covering everything from basic maintenance to complete engine and transmission overhauls. Includes detailed torque specifications, clearances, and repair procedures for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File Format File Format: PDF Searchability: Searchable text Print Quality Print Quality: High-resolution images and diagrams suitable for printing Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally-opposed turbocharged inline-4 (Boxer) Displacement: 2.0 Liters (1994 cc) Engine Code: EJ207 Performance Horsepower Est: 265 hp @ 6000 rpm (JDM specification) Torque Est: 253 lb-ft @ 4000 rpm (JDM specification) Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI), Electronic Throttle Control Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management ECU Type: Subaru Engine Control Unit (ECU) 🔧 Transmission Standard Transmission Type: 6-Speed Manual Transmission Optional Optional Transmission: N/A (STI models were exclusively manual) Features Dccd: Driver's Control Center Differential (manual and auto modes) AWD System: Symmetrical All-Wheel Drive with viscous center differential Fluid Specifications Transmission Fluid Type: Subaru Extra-S Gear Oil or equivalent API GL-5, SAE 75W-90 Front Differential Fluid Type: API GL-5, SAE 80W-90 Rear Differential Fluid Type: API GL-5, SAE 80W-90 📐 Dimensions Exterior Length: 4,485 mm (176.6 in) Width: 1,740 mm (68.5 in) Height: 1,415 mm (55.7 in) Wheelbase: 2,625 mm (103.3 in) Weights Curb Weight Est: 1,450 kg (3,197 lbs) Gross Vehicle Weight Rating Est: 1,900 kg (4,189 lbs) Cargo Trunk Volume Est: 0.33 m³ (11.7 cu ft) 🛡️ Safety Features Ratings NHTSA Front Impact Driver: Good (IIHS - for similar models) NHTSA Front Impact Passenger: Good (IIHS - for similar models) Active Features ABS: Standard Anti-lock Braking System Traction Control: Standard Electronic Brake Force Distribution: Standard Passive Features Airbags: Driver and front passenger airbags, side curtain airbags (optional/market dependent) Seatbelts: 3-point front and rear seatbelts with pretensioners and load limiters 💡 Technology Features Infotainment Infotainment System: Basic AM/FM/CD audio system with optional premium sound package. Digital integration was rudimentary compared to modern standards. Driver Assistance Driver Assistance Features: ABS, Traction Control System (TCS). Limited electronic driver aids beyond these basic systems. Connectivity Connectivity Features: N/A (No Bluetooth, USB, or smartphone integration) 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles (6,000 km) or 6 months, whichever comes first (severe duty driving...