🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STi Model Variant: WRX STi (Turbo) / Impreza (Non-Turbo) Year: 2006-2007 Codes Chassis Codes: GDB (STi), GD (Impreza) Engine Codes: EJ207 (STi JDM), EJ255 (STi USDM), EJ203/EJ204/EJ253 (Non-Turbo) 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon (Impreza), Rally Homologation Special (WRX STi) Target Audience: Enthusiast owners, DIY mechanics, professional technicians Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, Honda Civic Type R Key Differentiators: Symmetrical All-Wheel Drive, Rally heritage, Boxer engine, STi performance enhancements (turbo, suspension, DCCD) Key Features Manual Advantage: Authoritative, comprehensive coverage for both standard Impreza and high-performance WRX STi models. Vehicle Appeal: Iconic JDM tuning platform, capable AWD system, potent turbocharged engines in STi variants. 📋 Manual Details Coverage Areas General Coverage: All models, all repairs A-Z Specific Coverage: Mechanical, Electrical, Bodywork, Diagnostics, Maintenance, Repair, Troubleshooting Page Count Estimated Pages: Extensive (specific count not provided, but implied to be comprehensive) Manual Type Type: Workshop Service and Repair Manual Language Language: English Format Format: Printable Pages (Digital Format) 📖 Manual Coverage Systems Covered Powertrain: Engine (Turbocharged EJ207/EJ255, Naturally Aspirated EJ20/EJ25), Fuel System, Ignition System, Cooling System, Exhaust System, Lubrication System Drivetrain: Transmission (Manual), Drivetrain Components (Driveshafts, Differentials, AWD System - DCCD for STi) Chassis: Suspension (Front & Rear), Steering System, Braking System (ABS, Performance Brakes for STi) Electrical: Wiring Diagrams, Lighting, Starting & Charging System, Engine Control Unit (ECU), Body Control Module (BCM), Audio System, Climate Control, Power Accessories Body: Body Panels, Doors, Windows, Trim, Bumpers, Chassis Repair Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes (Oil, Coolant, Brake Fluid, Transmission Fluid), Filter Replacements, Spark Plug Replacement, Belt Inspection/Replacement Repair: Engine Overhaul, Transmission Rebuild, Suspension Component Replacement, Brake System Repair, Electrical Component Diagnosis and Repair, Turbocharger Servicing Diagnostics: Troubleshooting Guides, Diagnostic Trouble Codes (DTCs) Interpretation, Live Data Analysis (for applicable models/tools) Special Procedures: DCCD (Driver's Control Centre Differential) operation and servicing (STi), Alignment procedures, Clutch replacement, Turbocharger system diagnostics. Technical Depth Depth: Comprehensive (from basic maintenance to full engine/transmission rebuilds) Detail Level: Detailed step-by-step instructions with diagrams and specifications 📊 Manual Specifications File Format File Type: Digital (e.g., PDF) Searchability: Likely Searchable Text (common for workshop manuals) Print Quality Printability: All pages printable Image Quality: High-quality, detailed pictures and diagrams Binding Type Binding: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Sti Engine Jdm: 2.0L EJ207 Boxer Turbocharged (approx. 280 PS/276 hp, 392 Nm/289 lb-ft torque - JDM spec) Sti Engine Usdm: 2.5L EJ255 Boxer Turbocharged (approx. 300 hp, 290 lb-ft torque - USDM spec) Non Turbo Engine: 2.0L EJ203/EJ204 or 2.5L EJ253 Naturally Aspirated Boxer (Horsepower/Torque varies by specific model/market) Performance Boost Pressure: Variable, approximately 1.0-1.2 bar (14.5-17.4 psi) for STi (can vary) Redline: Typically around 7000-8000 RPM for STi EJ207, 6500 RPM for EJ255 Fuel System Induction: Multi-point Fuel Injection (MPI) / Sequential Electronic Fuel Injection (SEFI) Fuel Type: Premium Unleaded Gasoline (91 AKI or higher recommended for STi) Engine Components Turbocharger: IHI VF39/VF43 (STi USDM), IHI VF35/VF37 (STi JDM) - Twin Scroll on some JDM models Intercooler: Top-mount Air-to-Air Intercooler (STi) 🔧 Transmission Standard Sti Transmission: 6-Speed Manual (TY757) Non Turbo Transmission: 5-Speed Manual or 4-Speed Automatic (depending on specific model) Optional Optional Transmission: 4-Speed Automatic (Non-Turbo models only) Features AWD System: Symmetrical All-Wheel Drive with Driver's Control Centre Differential (DCCD) on STi models Gear Ratios: Specific ratios available in manual for each gear and differential Fluid Specs Manual Transmission Fluid: Subaru Extra-S Gear Oil (or equivalent API GL-5, SAE 75W-90) - Check manual for exact spec AWD Center Diff Fluid: Specific fluid for DCCD unit (refer to manual for part number/spec) 📐 Dimensions Exterior Wheelbase: Approx. 2625 mm (103.3 in) Length: Approx. 4405 mm (173.4 in) Width: Approx. 1775 mm (69.9 in) Height: Approx. 1440 mm (56.7 in) Weights Curb Weight Sti: Approx. 1430-1470 kg (3153-3241 lbs) Towing Capacity: Not specified/intended for towing Wheels Tires Wheel Size Sti: 17x8.0 or 18x8.5 (depending on trim/market) Tire Size Sti: 225/45R17, 235/40R18 (common sizes) Bolt Pattern: 5x100mm 🛡️ Safety Features Ratings NHTSA Ratings: Varies by model year and testing agency; consult specific reports for 2006-2007 Impreza. Active Features ABS: Standard on all models, with performance tuning on STi Traction Control: Available (may be linked with VDC - Vehicle Dynamics Control) Electronic Stability Control: Available (VDC - Vehicle Dynamics Control) Passive Features Airbags: Frontal Airbags, Side Airbags, Curtain Airbags (depending on trim/market) Seatbelts: Three-point front and rear seatbelts with pretensioners and load limiters Body Structure: Subaru's Ring-Frame reinforcement structure 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD stereo system, some models may have premium audio (e.g., McIntosh in some trims). Navigation: Optional factory navigation system available on some higher trims. Driver Assistance Cruise Control: Standard Limited Slip Differential: Front Helical LSD and Rear Viscous LSD standard on STi; DCCD...