🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2006 Codes Chassis Code: GDB Engine Code Primary: EJ257 👋 Introduction Market Position Positioning: Iconic rally-bred performance sedan, renowned for its AWD system and turbocharged engine Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Subaru WRX (standard model) Key Features Vehicle Differentiating Features: Symmetrical All-Wheel Drive, Driver Controlled Center Differential (DCCD), Active Torque Split, turbocharged Boxer engine, strong aftermarket support Manual Purpose Purpose: To provide comprehensive diagnostic, repair, and maintenance information for the 2006 Subaru Impreza WRX STI Target Audience Audience: Subaru WRX STI owners, independent repair shops, automotive technicians 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: Downloadable PDF Completeness: Complete Factory Official Service Information Page Count Estimated Pages: Hundreds 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel, ignition, emissions control, turbocharging system Transmission: Manual transmission (TY856WR) diagnosis, overhaul, and adjustment Drivetrain: All-Wheel Drive (AWD) system, center differential, front and rear differentials, drive shafts, CV joints Suspension: Front and rear suspension components, geometry, alignment, shock absorbers, springs, bushings Brakes: Brake system hydraulics, ABS (Anti-lock Braking System), rotors, calipers, pads, parking brake Steering: Power steering system, steering rack, tie rods, steering column Electrical: Battery, charging system, starter, lighting, wipers, horn, power windows, central locking, ECUs Body: Body construction, panels, doors, windows, bumpers, interior trim, exterior trim, chassis repair HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system diagnosis and repair Comfort Convenience: Seats, airbags, seatbelts, audio system, climate control controls Procedures Included Maintenance: Scheduled maintenance tasks, fluid changes, filter replacements, belt inspections Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based diagnostics Repair: Component removal, installation, and repair procedures for all major systems Overhaul: Detailed step-by-step instructions for engine and transmission overhauls Adjustment: Torque specifications, clearances, alignment settings, clutch adjustments Wiring Diagrams: Comprehensive electrical wiring diagrams for all vehicle systems Technical Depth Depth: Full factory level detail, suitable for professional technicians and advanced DIY enthusiasts Special Tools: Identification and usage of specialized tools required for specific procedures 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Searchable text content for quick information retrieval Print Quality Printability: Designed for printing, allowing users to print specific sections or the entire manual Binding Type Binding Type Physical: N/A (Digital Download) Paper Type Paper Type Physical: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally Opposed (Boxer), 4-cylinder, turbocharged, intercooled Displacement: 2.5 Liters (2457 cc) Bore X Stroke: 99.5 mm x 80.0 mm Compression Ratio: 8.0:1 Performance Horsepower SAE Net: 300 hp @ 6000 rpm Torque SAE Net: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Multi-point fuel injection (MPI) with electronic throttle control Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Turbocharging Turbocharger Model: IHI VF39 Intercooler Type: Top-mounted air-to-air intercooler Engine Management ECU Type: Engine Control Unit (ECU) with specific STI tuning 🔧 Transmission Standard Transmission Type: 6-speed manual transaxle (TY856WR) Features Dccd: Driver Controlled Center Differential (DCCD) with manual and automatic modes Clutch Type: Hydraulically actuated, multi-plate clutch Fluid Specs Transmission Fluid Type: Subaru Extra-S Gear Oil (or equivalent API GL-5, SAE 75W-90) Fluid Capacity Transmission Fluid Capacity: 2.4 Liters (approx.) 📐 Dimensions Exterior Length: 4415 mm (173.8 in) Width: 1750 mm (68.9 in) Height: 1420 mm (55.9 in) Wheelbase: 2625 mm (103.3 in) Weights Curb Weight: 1505 kg (3318 lbs) Gross Weight Rating: 1950 kg (4299 lbs) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-star NHTSA Side Impact: 4-star Active Features ABS: Standard Anti-lock Braking System (ABS) with EBD (Electronic Brakeforce Distribution) AWD: Symmetrical All-Wheel Drive (AWD) with DCCD Passive Features Airbags: Driver and front passenger airbags, front side-impact airbags Seatbelts: 3-point seatbelts with pretensioners and load limiters, LATCH child seat anchors Body Structure: Reinforced chassis and safety cage construction 💡 Technology Features Infotainment Infotainment System: Base audio system with CD player, AM/FM radio. Options may include upgraded speakers or amplifier. Driver Assistance Driver Assistance Features: ABS, EBD, AWD, DCCD. No modern electronic driver aids like stability control or traction control beyond mechanical systems. Connectivity Connectivity Features: Basic audio connectivity (e.g., auxiliary input might be present depending on trim). 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe driving conditions) or 7,500 miles or 12 months (normal driving conditions) Air Filter Replacement: Every 15,000 miles or 12 months Cabin Air Filter Replacement: Every 15,000 miles or 12 months Spark Plug Replacement: Every 30,000 miles (platinum-tipped) Timing Belt Replacement: Every 105,000 miles or 105 months (timing belt driven engine) Fluid Specifications Engine Oil Type: SAE 0W-30 or 5W-30 Synthetic (API SN or higher, ILSAC GF-5 or higher) Engine Oil Capacity: 4.8 Liters (5.1 US quarts) with filter change Coolant Type: Subaru Super Coolant (Blue) or equivalent ethylene glycol based coolant Brake Fluid Type: DOT 3 or DOT 4 Known Issues Common Issues...