🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Product Type: Service Repair Manual Codes Subaru Model Codes: GDA, GDB, GRB, GVB, VAB 👋 Introduction Market Position Positioning: Performance-oriented compact sedan/hatchback, rallying heritage, enthusiast-driven vehicle Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R Key Features Performance Focus: Symmetrical All-Wheel Drive, turbocharged boxer engines, performance-tuned suspension Driving Dynamics: Legendary handling, driver feedback, rally-bred DNA 📋 Manual Details Coverage Areas Engine Coverage: EJ207, EJ255, EJ257, EJ204 (NA variants for context, though STI focus is forced induction) Transmission Coverage: 5-speed Manual (GD chassis), 6-speed Manual (GR/GV/VA chassis), DCCD (Driver Controlled Center Differential) system Chassis Coverage: All chassis variants associated with WRX STI (e.g., GD, GG, GR, GV, GE, GH, VAB) Electrical Systems: Engine management, lighting, instrumentation, infotainment, power accessories, ABS, SRS (Airbag) Body And Interior: Body panels, doors, windows, seats, trim, climate control, safety restraints Page Count Estimated Pages: 1500+ Manual Type Type: Comprehensive Factory Service Manual / Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine, Turbocharger, Intercooler, Fuel System, Ignition System, Exhaust System, Cooling System, Lubrication System Drivetrain: Manual Transmission, Clutch, Differential (Front, Center, Rear), Driveshafts, Axles, AWD System Suspension And Steering: Front & Rear Suspension, Shock Absorbers, Springs, Control Arms, Sway Bars, Power Steering System, Steering Column Brakes: Hydraulic System, ABS, Brake Lines, Calipers, Rotors, Pads, Parking Brake Wheel And Tires: Wheel specifications, Tire pressure, Mounting procedures, Alignment specifications Procedures Included Maintenance: Scheduled maintenance, Oil changes, Filter replacements, Spark plug replacement, Belt inspection/replacement Diagnostics: Troubleshooting guides, Symptom-based diagnostics, DTC (Diagnostic Trouble Code) interpretation, Wiring diagrams Repair: Component removal/installation, Major overhauls, Component-specific repair procedures Rebuilding: Engine rebuild procedures, Transmission rebuild, Differential rebuild Calibration: Steering angle sensor, ABS module, Clutch system bleeding Technical Depth Depth: Factory-level diagnostic and repair information, suitable for professional technicians and advanced DIY enthusiasts Detail Level: Detailed torque specifications, clearance measurements, diagnostic flowcharts, wiring schematics 📊 Manual Specifications File Format PDF Quality: High-resolution, searchable text, bookmark navigation Printability: Printable pages for workshop use Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code Common: EJ257 (2.5L Turbocharged Boxer) Engine Layout: Horizontally-opposed (Boxer) Displacement Common: 2.5 Liters (2457cc) Induction: Turbocharged with Top-Mount Intercooler Valve Train: DOHC (Double Overhead Camshafts), 16 Valves Performance Horsepower Range: Approx. 300-320 HP (depending on generation and specific market) Torque Range: Approx. 300-330 lb-ft (depending on generation and specific market) Fuel System Fuel Delivery: Sequential Multi-Point Fuel Injection (MPI) Fuel Type Recommended: Premium Unleaded Gasoline (91+ Octane) Engine Management ECU Type: Engine Control Unit (ECU) with integrated Immobilizer and potentially other vehicle control modules 🔧 Transmission Standard Type Common: 6-speed Manual Transmission (TY856WR). Optional Type Older: 5-speed Manual Transmission (TY754) Features Dccd: Driver Controlled Center Differential (DCCD) with automatic and manual modes Fluid Specs Gear Oil Spec: Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent Gear Ratios Ratio Example: Specific ratios vary by generation; consult manual for exact ratios (e.g., 1st Gear: 3.636) 📐 Dimensions Exterior Length Example: Approx. 4415 mm (GD Hatchback) to 4600 mm (GV Sedan) - Varies by generation and body style Width Example: Approx. 1770 mm (GD) to 1795 mm (GR/GV/VA) - Varies by generation Height Example: Approx. 1440 mm (GD) to 1475 mm (GR/GV/VA) - Varies by generation Wheelbase Example: Approx. 2525 mm (GD) to 2625 mm (GR/GV/VA) - Varies by generation Weights Curb Weight Example: Approx. 1470 kg (GD) to 1500+ kg (GR/GV/VA) - Varies by generation and trim Gross Vehicle Weight Rating Example: Consult vehicle placard; typically around 1950 kg 🛡️ Safety Features Ratings NHTSA Ratings Example: Typically 5-Star NHTSA ratings for frontal and side impacts for relevant model years (check specific year) IIHS Ratings Example: Good ratings in various IIHS tests for relevant model years (check specific year) Active Features AWD System: Subaru Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) ABS: Anti-lock Braking System (ABS) Traction Control: Vehicle Dynamics Control (VDC) / Traction Control System (TCS) Passive Features Airbags: Driver and Passenger Frontal Airbags, Side Curtain Airbags, Front Side Airbags (depending on generation) Seatbelts: 3-point ELR Seatbelts with pretensioners and force limiters Body Structure: High-tensile steel body structure, front and rear crumple zones 💡 Technology Features Infotainment Head Unit Features: CD player, AM/FM radio, Bluetooth connectivity (later models), USB input, touch screen display (later models) Audio System Options: Harman Kardon audio system (optional on some trims) Driver Assistance Cruise Control: Standard cruise control Eyesight System: Subaru EyeSight driver assist technology available on later generations (pre-collision braking, adaptive cruise control, lane departure warning - typically not on STI models from factory) Connectivity Bluetooth: Available for hands-free calling and audio streaming on later models Performance Tech Si Drive: Subaru Intelligent Drive (SI-DRIVE) with Intelligent, Sport, and Sport Sharp modes to adjust throttle response and engine...