🏷️ Basic Information Identification Make: Subaru Model: Impreza (STI) Model Code: GDB Product Name: 2003 2004 Subaru Impreza (STI) Workshop Service Repair Manual Generation Generation Code: GD/GG Generation Years: 2000-2007 (GD/GG) Codes Chassis Code Gdb: GDB 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Target Audience: Enthusiasts, rally fans, performance car owners seeking detailed repair information Competitive Analysis Key Competitors Era: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R32 Key Features Performance Focus: Iconic turbocharged boxer engine, Symmetrical All-Wheel Drive (AWD) system, performance-tuned suspension and brakes Rally Heritage: Directly derived from Subaru's World Rally Championship (WRC) success 📋 Manual Details Coverage Areas Years Covered: 2003, 2004 Models Covered: Subaru Impreza WRX STI Regions Covered: Global (specific to WRX STI variants) Page Count Estimated Pages: Over 2000 pages (typical for comprehensive workshop manuals) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Engine: EJ257 Turbocharged Boxer Engine (Full overhaul, diagnostics, timing belt, cooling, lubrication, fuel, ignition, emissions) Transmission: 6-Speed Manual Transmission (TY856WB1AA) (Clutch, gearbox overhaul, drivetrain, differentials, AWD system) Suspension: Front McPherson Strut, Rear Independent Double Wishbone (Springs, struts, bushings, alignment procedures, hub assemblies) Brakes: Front 4-Piston (Brembo), Rear 2-Piston (Brembo) (Brake fluid, calipers, rotors, lines, ABS system) Electrical: Wiring diagrams, ECU diagnostics, lighting, power windows, audio system, instrument cluster, starter, alternator Body And Chassis: Frame, panels, doors, hood, trunk, interior trim, glass replacement, rust repair Climate Control: HVAC system (compressor, condenser, evaporator, heater core, refrigerant, blower motor) Fuel System: Fuel pump, injectors, fuel filter, fuel lines, EVAP system Cooling System: Radiator, hoses, thermostat, water pump, coolant specifications Exhaust System: Manifolds, catalytic converter, mufflers, pipes, gaskets Steering: Power steering system, steering column, rack and pinion Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, brake fluid flush, coolant flush, spark plug replacement Diagnostics: Troubleshooting charts, DTC code interpretation, sensor testing, component testing Repair: Component removal and installation, engine rebuild, transmission overhaul, suspension component replacement, body panel repair Installation: Component upgrades (e.g., turbocharger, intercooler - though focus is OEM), accessory installation Specifications: Torque specifications, clearances, tolerances, fluid capacities, wiring diagrams Technical Depth Depth: Comprehensive (from basic maintenance to full engine and transmission rebuilds, including electrical diagnostics) Diagnostic Tools: Information applicable to Subaru Select Monitor (SSM) or OBD-II scan tools Special Tools: References to Subaru-specific special tools for various procedures (e.g., timing belt tensioner tool, injector puller) 📊 Manual Specifications File Format Digital Format: PDF (Searchable text is highly probable for quality manuals) Print Quality Resolution: High-resolution scans ensuring clarity of diagrams and text Binding Type Digital Binding: N/A (Digital format) Paper Type Digital Paper Type: N/A (Digital format) Completeness Completeness Claim: 100% Complete (as per product description, implying no missing sections) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: DOHC 16-valve turbocharged boxer-4 Displacement: 2457 cc (2.5 Liters) Performance Horsepower Usdm: 265 hp @ 5600 rpm (approx.) Torque Usdm: 247 lb-ft @ 3600 rpm (approx.) Compression Ratio: 8.0:1 Turbocharger: IHI VF39 (water-cooled, ball-bearing) Intercooler: Top-mounted air-to-air Fuel System Fuel Delivery: Multi-point fuel injection (MPFI) Fuel Type: Unleaded gasoline (91 octane or higher recommended) Throttle Body: Drive-by-wire (electronic throttle control) 🔧 Transmission Standard Type: 6-Speed Manual Transmission Model Code: TY856WB1AA Optional Type: N/A (STI was manual-only) Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Differentials: Front Helical LSD, Rear Helical LSD, DCCD Center Diff Gear Ratios: Refer to manual for specific ratios (6-speed specific ratios) 📐 Dimensions Exterior Wheelbase: 2525 mm (99.4 in) Length: 4405 mm (173.4 in) Width: 1770 mm (69.7 in) Height: 1410 mm (55.5 in) Ground Clearance: 135 mm (5.3 in) Weights Curb Weight: Approx. 1470 kg (3240 lbs) Gross Vehicle Weight Rating: Refer to vehicle placard Cargo Trunk Volume: Refer to manual (varies by body style - sedan/wagon) 🛡️ Safety Features Ratings NHTSA Front Impact: 4/5 Stars (for comparable 2003-2004 models) NHTSA Side Impact: 4/5 Stars (for comparable 2003-2004 models) IIHS Frontal Offset: Good (for comparable 2003-2004 models) Active Features ABS: Standard (4-wheel ABS with EBD) Traction Control: Subaru Vehicle Dynamics Control (VDC) available on some models/trims AWD: Symmetrical All-Wheel Drive (standard) Passive Features Airbags: Front dual-stage airbags, front side-impact airbags Seatbelts: 3-point seatbelts with pretensioners and force limiters Child Anchors: LATCH (Lower Anchors and Tethers for Children) system 💡 Technology Features Infotainment Head Unit: Factory fitted AM/FM stereo with CD player. Aftermarket options are common. Speaker System: Standard speaker configuration, often with front tweeters. Upgrades are popular. Driver Assistance Cruise Control: Standard Anti Lock Brakes: Standard (4-wheel ABS) Stability Control: Subaru Vehicle Dynamics Control (VDC) optional or standard on some trims. Connectivity Auxiliary Input: Rarely standard on factory units, often an aftermarket addition. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe use), 7,500 miles or 12 months (normal use) - refer to manual for...