🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Engine Type: Gasoline Codes Chassis Code: GDB Engine Code: EJ207 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Niche: Rally-bred performance, all-wheel-drive capability Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Ford Focus RS (later models), Volkswagen Golf GTI Key Features Drivetrain: Symmetrical All-Wheel Drive (AWD) Engine: EJ207 turbocharged Boxer engine Transmission: 6-speed manual transmission Suspension: Performance-tuned suspension with DCCD (Driver Controlled Center Differential) Brakes: Brembo performance brake system Aero: Aggressive aerodynamic enhancements including rear wing 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive Service and Repair Secondary Coverage: Maintenance, Troubleshooting, Diagnostics Page Count Estimated Pages: 1000+ Manual Type Type: Factory Service Manual (FSM) Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, timing belt, pistons, crankshaft, cylinder heads, valve train Engine Performance: Turbocharger system, fuel injection, ignition system, ECU diagnostics, emissions controls Transmission Drivetrain: Manual transmission (6-speed), clutch, drivetrain components, differentials (front, rear, center DCCD) Suspension Steering: MacPherson struts, multi-link rear, springs, dampers, steering rack, power steering system Brakes: Front Brembo 4-piston calipers, rear 2-piston calipers, ABS, EBD, brake fluid specifications Electrical: Wiring diagrams, fuse box layouts, starter, alternator, battery, lighting, power windows, central locking Bodywork Chassis: Body panel removal/installation, chassis structure, door mechanisms, exterior trim, interior trim HVAC: Air conditioning system, heater core, climate control Fuel System: Fuel tank, fuel pump, fuel injectors, fuel pressure regulator Procedures Included Scheduled Maintenance: Oil changes, filter replacements, fluid checks, spark plug replacement, timing belt replacement intervals Troubleshooting Diagnostics: Fault code interpretation (OBD-II), diagnostic procedures for common issues, wiring harness testing Repair Rebuild: Engine rebuild procedures, transmission overhaul, suspension component replacement, brake caliper overhaul Component Replacement: Turbocharger replacement, clutch replacement, clutch slave cylinder replacement, fuel pump replacement Wheel Alignment: Specifications and procedures for wheel alignment Airbag System: Information on airbag system safety and component replacement Technical Depth Depth: Factory-level diagnostic and repair procedures Diagnostics: Detailed troubleshooting trees and symptom-based diagnostics Specifications: Torque values, clearances, tolerances, fluid capacities Diagrams: Exploded views, wiring diagrams, system schematics 📊 Manual Specifications File Format File Type: PDF Searchability: Text-searchable Print Quality Quality: High-resolution, printable pages Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Name: EJ207 Configuration: 2.0L Boxer-4 (H4) Aspiration: Twin-Scroll Turbocharged Bore X Stroke: 92.0 mm x 75.0 mm Compression Ratio: 8.0:1 Valvetrain: DOHC, 16 valves Performance Horsepower: 268 hp @ 6000 rpm (JDM spec) Torque: 258 lb-ft @ 4000 rpm (JDM spec) Fuel System Fuel Delivery: Sequential Electronic Fuel Injection (SEFI) Fuel Type: Unleaded gasoline (premium recommended) Ignition System: Electronic ignition with knock sensor Cooling System Type: Liquid-cooled Capacity: Approx. 6.0 Liters Lubrication System Type: Forced lubrication, wet sump Oil Capacity: Approx. 4.5 Liters (w/ filter) Engine Mounts Type: Hydraulic engine mounts 🔧 Transmission Standard Type: 6-speed Manual Gear Ratios: 1st: 3.636, 2nd: 2.053, 3rd: 1.545, 4th: 1.137, 5th: 0.942, 6th: 0.777, Reverse: 3.545 Final Drive Ratio: 3.545 Optional Type: N/A (STI was exclusively manual) Features Dccd: Driver Controlled Center Differential (DCCD) with auto/manual modes Fluid Specifications Manual Transmission Fluid: Subaru Extra-S Gear Oil API GL-5 75W-90 or equivalent Clutch Type: Hydraulically operated, single dry plate clutch 📐 Dimensions Exterior Length: 4415 mm (173.8 in) Width: 1770 mm (69.7 in) Height: 1440 mm (56.7 in) Wheelbase: 2625 mm (103.3 in) Track Width Front: 1530 mm (60.2 in) Track Width Rear: 1535 mm (60.4 in) Ground Clearance: 135 mm (5.3 in) Weights Curb Weight: Approx. 1440 kg (3175 lbs) Wheels Tires Wheel Size: 17 x 7.5 inches Bolt Pattern: 5 x 114.3 mm (5x4.5 inch) Tire Size: 225/45R17 🛡️ Safety Features Ratings NHTSA Front Impact: 4/5 Stars (Driver/Passenger - US models) NHTSA Side Impact: 4/4 Stars (Front/Rear - US models) IIHS Frontal Offset: Good Active Features ABS: Standard Anti-lock Braking System Ebd: Standard Electronic Brake-force Distribution AWD: Standard Symmetrical All-Wheel Drive with DCCD Passive Features Airbags: Driver and front passenger airbags Seatbelts: Three-point seatbelts with pretensioners Chassis: Reinforced chassis structure 💡 Technology Features Infotainment Head Unit: Factory-installed AM/FM/CD player (typically basic) Speakers: Standard speaker configuration (4-6 speakers) Driver Assistance Stability Control: Traction Control System (TCS) Cruise Control: Standard Cruise Control Connectivity Auxiliary Input: Rarely standard, often requires aftermarket modification Instrumentation Gauges: Tachometer, speedometer, fuel gauge, coolant temperature, boost gauge (integrated) Climate Control Type: Manual climate control with A/C 🔧 Maintenance Service Intervals Engine Oil Change: Every 3,000-5,000 miles or 6 months, depending on driving conditions (severe service requires more frequent changes) Engine Oil Filter Replacement: With every oil change Air Filter Replacement: Every 15,000-30,000 miles Cabin Air Filter Replacement: Every 15,000-30,000 miles Spark Plug Replacement: Every 60,000 miles (iridium type) Timing Belt Replacement: Every 90,000-105,000 miles or 7 years (critical replacement) Coolant Flush: Every 30,000 miles or 2 years Fluid Specifications Engine Oil Type: Synthetic 5W-30 or 5W-40 (check manual...