🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2006 Codes Chassis Code: GDB Generation Generation: Third Generation (GD/GG chassis - Japan/Global, GDB - North America) 👋 Introduction Market Position Segment: Performance Compact / Rally-inspired Sport Sedan Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R32, Honda Civic Type R Key Features Drivetrain: Symmetrical All-Wheel Drive (SAWD) system Engine Layout: Horizontally-opposed (Boxer) turbocharged engine Suspension Type: Independent front and rear suspension, performance-tuned STI suspension components Braking System: High-performance Brembo brakes (front and rear) Manual Value Proposition Target User: Enthusiast owners, independent repair shops, performance tuners 📋 Manual Details Coverage Areas Coverage: Complete Service and Repair Procedures for the 2006 Subaru Impreza WRX STI Page Count Page Count: Approximately 2000+ pages (typical for comprehensive dealer-level manuals) Manual Type Type: Factory Service Manual (FSM) / Workshop Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine disassembly, assembly, component testing, specifications ( EJ257 'Boxer' engine) Engine Management: Fuel injection, ignition system, emissions control, ECU diagnostics, sensor data Transmission: 6-speed manual transmission (TY757) overhaul, clutch system, driveline components Suspension: Front and rear suspension components, alignment procedures, shock absorbers, springs, bushings Brakes: Brake system diagnostics, hydraulic components, ABS system, rotor/pad replacement, bleeding procedures Steering: Power steering system, steering rack, tie rods, alignment specifications Electrical System: Wiring diagrams, component testing, battery, alternator, starter, lighting, fuses, relays Body And Chassis: Body panel removal/installation, interior trim, glass, doors, frame straightening (if applicable) HVAC: Heating, Ventilation, and Air Conditioning system diagnosis and repair Safety Systems: Airbag system diagnosis and service, seatbelt mechanisms Procedures Included Scheduled Maintenance: Detailed maintenance schedules and procedures Troubleshooting: Diagnostic flowcharts and symptom-based troubleshooting guides Repair And Rebuild: Step-by-step repair instructions for all major components Diagnostics: OBD-II diagnostic trouble codes (DTCs) and related troubleshooting Torque Specifications: Comprehensive list of torque specifications for all fasteners Special Tools: Identification and usage of Subaru-specific special tools Technical Depth Depth: Comprehensive: Covers from basic fluid changes to complete engine and transmission rebuilds 📊 Manual Specifications File Format Quality: High-resolution PDF with searchable text Printable: Yes, designed to be printable for workshop use Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L turbocharged horizontally-opposed (Boxer) 4-cylinder Performance Horsepower: 300 hp @ 6000 rpm (SAE Net) Torque: 290 lb-ft @ 4000 rpm (SAE Net) Fuel System Fuel Delivery: Multi-point sequential fuel injection Fuel Type: Unleaded Premium Gasoline (91 Octane or higher recommended) Engine Components Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.5:1 Turbocharger Model: IHI VF39 Fluid Capacity Engine Oil Capacity: 4.8 US quarts (4.5 Liters) with filter change 🔧 Transmission Standard Type: 6-speed Manual Transmission Transmission Code: TY757 Optional Type: N/A (STI models exclusively featured manual transmission) Features Differentials: Driver-Controlled Center Differential (DCCD), Helical front LSD, Viscous rear LSD Fluid Specifications Manual Transmission Fluid: API GL-4 or GL-5, SAE 75W-90 (Subaru Extra-S or equivalent recommended) Fluid Capacity Manual Transmission Fluid Capacity: 2.3 US quarts (2.2 Liters) 📐 Dimensions Exterior Length: 173.8 inches (4415 mm) Width: 69.7 inches (1770 mm) Height: 56.1 inches (1425 mm) Wheelbase: 104.0 inches (2640 mm) Weights Curb Weight: Approx. 3375 lbs (1530 kg) Gross Vehicle Weight Rating: Approx. 4400 lbs (1996 kg) 🛡️ Safety Features Ratings NHTSA Frontal Driver: 5-Star (2006 Model Year) NHTSA Frontal Passenger: 5-Star (2006 Model Year) Active Features ABS: 4-wheel Anti-lock Braking System (ABS) Traction Control: Active All-Wheel Drive with Driver-Controlled Center Differential (DCCD) Passive Features Airbags: Driver and front passenger airbags, front side-impact airbags Seatbelts: 3-point height-adjustable front seat belts with pretensioners and force limiters, rear 3-point seat belts 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD stereo system with premium speaker options Driver Assistance AWD Control: Driver-Controlled Center Differential (DCCD) with automatic and manual modes Connectivity Diagnostic Port: OBD-II (On-Board Diagnostics II) compliant port for engine and system diagnostics 🔧 Maintenance Service Intervals Oil Change: Every 3,750 miles or 3.75 months (severe driving) / 7,500 miles or 7.5 months (normal driving) - consult manual for specifics Air Filter Replacement: Every 15,000 miles or 15 months Spark Plug Replacement: Every 30,000 miles (iridium type) Timing Belt: Not applicable (uses a timing chain) Fluid Specifications Coolant: Subaru Super Coolant (Blue) or equivalent OAT coolant, mixed 50/50 with distilled water Brake Fluid: DOT 3 or DOT 4 compatible brake fluid Power Steering Fluid: Subaru ATF-HP or equivalent DEXRON-III/MERCON compatible automatic transmission fluid Known Issues Head Gaskets: While less prevalent than earlier EJ engines, potential for coolant leaks exists. Manual details inspection procedures. Piston Slap: Some EJ257 engines can exhibit piston slap under cold start conditions. Manual offers diagnostic guidance. Clutch Wear: Performance driving can accelerate clutch wear. Manual covers clutch inspection and replacement. Turbocharger Failure: Improper maintenance or oil starvation can lead to...