🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX (STI) Model Variant: WRX STI Production Years: 2003, 2004 Codes Chassis Code: GDB Engine Code: EJ207 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Target Audience: Enthusiasts, DIY mechanics, professional technicians Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS (era) Key Features All Wheel Drive: Subaru's Symmetrical All-Wheel Drive System Turbocharged Engine: High-performance EJ207 Boxer Engine Handling: Renowned for exceptional grip and agility Rally Heritage: Direct lineage from Subaru's WRC success 📋 Manual Details Coverage Areas Covered Styles: All Page Count Estimated Page Count: 1500+ Manual Type Type: Service & Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine: Complete Overhaul, Diagnostics, Tuning Transmission: Manual (6-speed), Clutch, Drivetrain Suspension: Front & Rear McPherson Struts, Anti-Roll Bars, Alignment Brakes: ABS, Front/Rear Discs, Brembo Calipers (STI) Electrical: Wiring Diagrams, ECU, Lighting, Sensors Body And Chassis: Frame, Panels, Doors, Exterior Trim HVAC: Air Conditioning, Heating, Ventilation Fuel System: Fuel Pump, Injectors, Lines, Tank Cooling System: Radiator, Water Pump, Thermostat Exhaust System: Catalytic Converter, Mufflers, Piping Interior: Seats, Dashboard, Trim Panels Procedures Included Routine Maintenance: Oil Changes, Filter Replacements, Spark Plugs Troubleshooting: Diagnostic Codes, Symptom Analysis, Component Testing Engine Rebuild: Top-End and Bottom-End Overhaul, Piston/Ring Replacement Transmission Repair: Gearbox Disassembly, Reassembly, Bearing Replacement Brake Service: Pad/Rotor Replacement, Caliper Service, Bleeding Suspension Replacement: Strut/Shock Absorber, Bushing, Ball Joint Replacement Electrical Diagnostics: Component Testing, Wiring Harness Repair Turbocharger Service: Inspection, Rebuild, Installation Timing Belt Replacement: Procedure for EJ207 Engine Wheel Alignment: Specifications and Adjustment Procedures Technical Depth Depth: Comprehensive: From basic maintenance to full engine and transmission rebuilds, including advanced diagnostics. 📊 Manual Specifications File Format Searchability: High (Text-searchable PDF) Printability: Yes (Printable pages) Print Quality Quality: Excellent (High-resolution images, clear diagrams) Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: EJ207 Flat-4 (Boxer), DOHC, 16 Valves, Turbocharged Displacement: 2.0 Liters (1994 cc) Bore X Stroke: 92.0 mm x 75.0 mm Compression Ratio: 8.0:1 Engine Management: ECU controlled sequential fuel injection, distributorless ignition Performance Horsepower: 265-280 PS (195-206 kW) at 5600-6000 rpm (varies by market) Torque: 253-272 lb-ft (343-369 Nm) at 4000-4400 rpm (varies by market) Redline: 7500 RPM Fuel System Fuel Type: Premium Unleaded (91+ octane recommended) Fuel Delivery: Multi-point Fuel Injection (MPI) Turbocharger Spec: IHI VF34 (or similar twin-scroll configuration) Intercooler: Air-to-Air Top Mount Intercooler 🔧 Transmission Standard Transmission Type: 6-Speed Manual (TY757) Optional Optional Transmission: N/A (STI models exclusively manual) Features Differentials: Driver Controlled Center Differential (DCCD), Helical front LSD, Helical rear LSD Gear Ratios: Refer to manual for specific ratios (typically close-ratio) Clutch Type: Hydraulically actuated multi-plate clutch 📐 Dimensions Exterior Length: 4415 mm (173.8 in) Width: 1770 mm (69.7 in) Height: 1410 mm (55.5 in) Wheelbase: 2625 mm (103.3 in) Front Track: 1500 mm (59.1 in) Rear Track: 1495 mm (58.9 in) Weights Curb Weight: 1430 kg (3153 lbs) Gross Vehicle Weight Rating: Refer to vehicle placard Towing Capacity: Not Specified (Performance vehicle) 🛡️ Safety Features Ratings NHTSA Front Impact: 4-star (Driver), 4-star (Passenger) NHTSA Side Impact: 5-star (Driver), 5-star (Rear Passenger) IIHS Frontal Offset: Good Active Features ABS: Standard Anti-lock Braking System Traction Control: Standard Electronic Brake-Force Distribution: Standard (EBD) Passive Features Airbags: Driver and Passenger Front Airbags, Side Airbags Seatbelts: 3-point front and rear seatbelts with pretensioners Body Structure: Reinforced chassis with crumple zones 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD player with optional premium sound system. Display: Basic LCD display for radio and clock. Driver Assistance Driver Assistance Systems: Limited to ABS and Traction Control. No advanced driver-assistance systems (ADAS). Connectivity Connectivity Options: No Bluetooth or USB connectivity in standard configuration. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles (6,000 km) or 6 months, whichever comes first (severe driving conditions recommended for performance vehicles) Timing Belt Replacement Interval: Every 105,000 miles (168,000 km) or 7 years Spark Plug Replacement Interval: Every 30,000 miles (48,000 km) for iridium-tipped plugs Coolant Flush: Every 30,000 miles (48,000 km) or 2 years Fluid Specifications Engine Oil Type: SAE 5W-30 Synthetic (API SG or SH, ACEA A2/B2) Engine Oil Capacity: 4.5 Liters (4.8 US Quarts) with filter change Coolant Type: Subaru Super Coolant (Blue) or equivalent Transmission Fluid Type: SAE 75W-90 (API GL-5) Gear Oil (Front & Rear Differentials and Transmission) Brake Fluid Type: DOT 3 or DOT 4 Known Issues Piston Ringland Failure: Common in heavily modified or poorly maintained EJ207 engines, especially with aggressive tuning. Clutch Wear: Can wear prematurely with aggressive driving. Suspension Bushings: Can degrade over time, leading to creaks and handling issues. Water Pump Leaks: Common failure point, often replaced with timing belt service. Oil Cooler Leaks: Can develop leaks over time. 📚 Vehicle History Brand Heritage Brand Focus: Symmetrical All-Wheel Drive and Boxer Engines Motorsport Connection: Extensive World Rally...