🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2006 Codes Chassis Code: GDB Engine Code Primary: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Target Audience: Enthusiasts, performance drivers, rally sport fans, owners seeking to maintain or modify their vehicle. Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Subaru WRX (standard model), Ford Focus RS, Volkswagen Golf GTI/R32. Key Features Performance Focus: All-wheel-drive (Symmetrical AWD), turbocharged engine, rally-bred performance heritage. Handling Dynamics: Driver-focused chassis, responsive steering, performance-tuned suspension. 📋 Manual Details Coverage Areas Manual Type: Complete Service & Repair Manual Language: English Format: Downloadable Digital File (likely PDF) Page Count Estimated Page Count: 1500+ 📖 Manual Coverage Systems Covered Engine Mechanical: Engine overhaul, assembly, disassembly, inspection, troubleshooting, repair of all internal components (pistons, rings, rods, crankshaft, camshafts, valves, timing belt/chain, etc.). Engine Performance: Turbocharger system, intercooler, intake and exhaust manifolds, fuel injection, ignition system, engine management system (ECU), emissions control. Transmission: Manual transmission (TY757) repair, clutch system, driveline, differentials (front, center, rear), propeller shaft, drive axles. Brakes: Hydraulic system, ABS, brake calipers, rotors, pads, master cylinder, brake lines, parking brake, bleeding procedures. Suspension: Front and rear suspension components (struts, springs, control arms, bushings, sway bars), alignment specifications, troubleshooting. Steering: Power steering system, steering rack, tie rods, steering column, troubleshooting. Electrical System: Battery, charging system (alternator), starting system (starter), lighting, fuses, relays, wiring diagrams, diagnostic connectors (OBD-II). HVAC: Heating, ventilation, and air conditioning system (compressor, condenser, evaporator, refrigerant handling, controls). Body And Chassis: Body panel removal and installation, doors, windows, interior trim, seats, bumpers, underbody, corrosion protection. Interior: Dashboard, instrument panel, seats, seat belts, airbags (SRS), interior trim components, audio system, switches. Procedures Included Scheduled Maintenance: Oil changes, filter replacements, fluid checks and changes, spark plug replacement, timing belt inspection/replacement (if applicable), brake service, tire rotation. Troubleshooting: Systematic diagnostic procedures for common and uncommon faults, symptom-based troubleshooting guides, fault code interpretation. Repair Procedures: Step-by-step instructions for component removal, repair, overhaul, and reinstallation for all major vehicle systems. Diagnostic Procedures: ECM diagnostic trouble codes (DTCs), sensor testing, actuator testing, fuel pressure testing, compression testing. Technical Depth Diagnostic Tools: Specifications for required diagnostic tools, scan tools, multimeters, pressure gauges, and specialized Subaru tools. Torque Specifications: Precise torque values for all critical fasteners, including engine components, suspension, brakes, and body panels. Clearances And Tolerances: Factory specifications for engine component clearances, bearing play, valve lash, and other critical tolerances. Wiring Diagrams: Comprehensive electrical system wiring diagrams for all circuits, including component locations and wire colors. 📊 Manual Specifications File Format File Type: Likely PDF (Portable Document Format) Searchability: Typically searchable text-based PDF, allowing quick navigation via keywords. Print Quality Resolution: High resolution suitable for printing individual pages or the entire manual. Binding Type Binding Method: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L Flat-Four (Boxer) DOHC Turbocharged Performance Horsepower Est: 293 hp @ 6000 rpm Torque Est: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Cooling System Cooling Type: Liquid-cooled Timing Timing Belt Replacement Interval Est: Refer to manual for specific mileage/time interval; typically around 60,000-100,000 miles or 5-7 years. 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission Transmission Model Est: TY757 Optional Optional Transmission: N/A for WRX STI model Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Clutch Type: Hydraulic, single-plate dry 📐 Dimensions Exterior Length Est: 173.8 inches Width Est: 69.7 inches Height Est: 57.9 inches Wheelbase Est: 103.0 inches Weights Curb Weight Est: 3373 lbs (Sedan) Gross Vehicle Weight Rating Est: 4550 lbs 🛡️ Safety Features Ratings NHTSA Front Impact Est: 5-star driver, 4-star passenger IIHS Side Impact Est: Good Active Features Traction Control: Standard Electronic Stability Control: Standard ABS: Standard Anti-lock Braking System Passive Features Airbags: Frontal airbags, front side-impact airbags, full-length side curtain airbags (standard on some trims). Seat Belts: 3-point front and rear seat belts with pretensioners and load limiters. 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD audio system, often with premium speaker option. Aftermarket upgrades common. Driver Assistance Dccd System: Driver Controlled Center Differential allows manual adjustment of front-to-rear torque split for optimal handling. Connectivity OBD Ii Port: Standard OBD-II diagnostic port for reading engine codes and live data. 🔧 Maintenance Service Intervals Oil Change Interval Est: Every 3,000-5,000 miles or 3-6 months, depending on driving conditions (severe vs. normal). Engine Oil Capacity Est: 5.8 US quarts (with filter) of 5W-30 synthetic oil. Fluid Specifications Engine Oil Type: SAE 5W-30 Synthetic API SG/SH/SJ/SL/SM certified Transmission Fluid Type: API GL-4 or GL-5, SAE 75W-90 (manual transmission) Differential Fluid Type: API GL-5, SAE 75W-90 (front and rear differentials) Coolant Type: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant with Subaru's additive package. Known...