🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STi Model Code: GDB (C, D, E, F, G Series - JDM & USDM variations) Years Covered: 2006-2007 Codes Chassis Code: GDB Engine Code Primary: EJ257 Engine Code Secondary: EJ207 (some JDM variants) 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Usp: All-wheel drive, turbocharged performance, rally heritage. Competitive Analysis Competitors 2006 2007: Mitsubishi Lancer Evolution, Subaru WRX (non-STi), Volkswagen GTI, Mazdaspeed3, Honda Civic Si. Key Features Performance Focus: Designed for enthusiasts seeking high-performance driving and track capability. Technical Documentation: Provides factory-level diagnostic and repair procedures. 📋 Manual Details Coverage Areas Scope: All Models & Repairs A-Z Repair Type: Mechanical & Electrical Page Count Estimated Pages: Over 3000 (typical for comprehensive workshop manuals) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Digital (likely PDF, printable pages) 📖 Manual Coverage Systems Covered Powertrain: Engine (EJ257/EJ207), Fuel System, Ignition System, Exhaust System, Cooling System, Lubrication System Drivetrain: Transmission (6-speed manual), Drivetrain Components (DCCD, differentials), Axles, Driveshafts Chassis Suspension: Front & Rear Suspension (MacPherson strut front, multi-link rear), Steering System, Wheel Bearings Brakes: Brake System (ABS, hydraulic components), Brake Pad/Rotor Replacement, Caliper Overhaul Electrical: Wiring Diagrams, Fuses & Relays, Lighting System, Power Windows, Locks, Audio System, ECU Diagnosis Body And Interior: Body Panels, Doors, Windows, Seats, Upholstery, HVAC System Procedures Included Routine Maintenance: Oil Changes, Filter Replacements, Spark Plug Service, Fluid Checks & Replacements Diagnostic Troubleshooting: Error Code Interpretation, Component Testing, System Malfunction Analysis Major Repairs: Engine Rebuilds, Transmission Overhaul, Turbocharger Service, Suspension Component Replacement Electrical Diagnostics: Wiring Harness Repair, Sensor Diagnosis, ECU/TCU Reprogramming (if applicable) Technical Depth Depth: Comprehensive: Covers everything from basic fluid changes to full engine and transmission rebuilds. Detail Level: Includes detailed pictures and diagrams for step-by-step guidance. 📊 Manual Specifications File Format Digital Format: PDF (Portable Document Format) Print Quality Printability: All pages printable Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type Usdm: 2.5L Flat-4 Turbocharged DOHC (EJ257) Engine Type Jdm: 2.0L Flat-4 Turbocharged DOHC (EJ207 - varies) Performance Horsepower Usdm Ej257: 300 hp @ 6200 RPM (approx.) Torque Usdm Ej257: 300 lb-ft @ 4000 RPM (approx.) Horsepower Jdm Ej207: 280 PS (276 hp) @ 6400 RPM (often quoted, actual higher in some tunes) Torque Jdm Ej207: 333 Nm (246 lb-ft) @ 4400 RPM (often quoted) Fuel System Fuel Delivery: Sequential Multiport Fuel Injection (PGM-FI) Fuel Type: Premium Unleaded Gasoline (91 Octane or higher recommended) Turbocharger: IHI VF39 (USDM), IHI VF36/VF37 (JDM variations) 🔧 Transmission Standard Transmission Type: 6-Speed Manual Transmission AWD System: Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) Features Dccd Operation: Automatic and Manual modes for differential lock-up control. Fluid Specifications Manual Transmission Fluid: Subaru Extra-S (or equivalent GL-5 75W-90 synthetic) 📐 Dimensions Exterior Length: Approx. 4,415 mm (173.8 in) Width: Approx. 1,770 mm (69.7 in) Height: Approx. 1,425 mm (56.1 in) Weights Curb Weight: Approx. 1,470 kg (3,240 lbs) Wheelbase: Approx. 2,625 mm (103.3 in) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (for relevant models/testing) IIHS Side Impact: Good (for relevant models/testing) Active Features ABS: Standard Anti-lock Braking System Traction Control: Standard Stability Control: Subaru Vehicle Dynamics Control (VDC) - Standard Passive Features Airbags: Driver and Passenger Front Airbags, Side Airbags, Curtain Airbags Seatbelts: 3-point ELR seatbelts with pretensioners and force limiters 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD with optional navigation system and premium speaker upgrades. Driver Assistance Active Safety: VDC (Vehicle Dynamics Control) enhances stability during cornering and evasive maneuvers. Connectivity Cruise Control: Standard Electronic Cruise Control. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe duty), 7,500 miles or 12 months (normal duty). Consult manual for specifics. Timing Belt Replacement: 105,000 miles or 105 months (or as per manual, crucial for EJ engines). Spark Plug Replacement: Every 30,000 - 60,000 miles depending on plug type (iridium recommended). Fluid Specifications Engine Oil Type: 5W-30 Synthetic (API SN or higher recommended) Engine Oil Capacity: Approx. 4.8 US quarts (4.5 liters) with filter change. Coolant Type: Subaru Super Coolant (Blue) or equivalent HOAT coolant. Known Issues Head Gaskets: While less common on EJ257 than earlier EJ25 models, always a point of inspection. Manual covers diagnostic procedures. Piston Slap: Can occur on some EJ engines, particularly when cold. Manual provides diagnostic steps. Clutch Wear: Performance driving can accelerate clutch wear. Manual details clutch replacement. 📚 Vehicle History Brand Heritage Rally Connection: Direct lineage from Subaru's World Rally Championship success. Model Evolution Generation Gdb: Third generation Impreza (2002-2007), with the WRX STi being the pinnacle performance variant. Updates 2006 2007: Mid-cycle refresh (GH/GE model generation), significant chassis and styling updates compared to earlier GDB models. Production Manufacturing Location: Gunma Plant, Japan 🏆 Awards & Recognition Recognitions Sport Compact Awards: Consistently recognized as a top...