🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2009 Engine: 2.5L turbocharged flat-four (EJ257) Body Style: Sedan Codes Chassis Code: GRB (Hatchback), GVB (Sedan) Engine Code: EJ257 👋 Introduction Market Position Segment: Performance compact sedan/hatchback Target Audience: Enthusiasts, performance drivers, motorsport participants Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS (in certain markets) Key Features Performance Focus: Symmetrical All-Wheel Drive, potent turbocharged engine, performance-tuned suspension Driver Controls: Driver-Controlled Center Differential (DCCD), SI-Drive system Value Proposition Manual Value: Essential for owners seeking to maintain, repair, or enhance their high-performance vehicle 📋 Manual Details Coverage Areas Coverage Scope: Complete official service and repair for all models and engines Page Count Estimated Pages: Over 3000 (typical for comprehensive service manuals of this era) Manual Type Type: Official Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, pistons, crankshaft, camshafts, timing system, lubrication system, cooling system Engine Performance: Fuel injection, ignition system, turbocharger system, exhaust system, emissions control Transmission Drivetrain: Manual transmission (TY85), clutch, driveshafts, differentials (front, center, rear), AWD system (DCCD) Suspension Steering: Front suspension (struts, control arms), rear suspension (multi-link), steering system (power assist), alignment specifications Brakes: Front and rear brake systems, ABS, EBD, parking brake, brake fluid specifications Electrical Electronics: Battery, charging system, starter motor, lighting, instrument cluster, audio system, power accessories, wiring diagrams Body Chassis: Body construction, exterior panels, doors, windows, interior trim, underbody components HVAC: Heating, ventilation, and air conditioning systems Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection and replacement Troubleshooting: Diagnostic procedures for engine, transmission, electrical, and chassis systems, symptom-based troubleshooting charts Repair: Engine rebuilds, transmission overhaul, brake caliper replacement, suspension component renewal, electrical component repair Diagnostics: OBD-II diagnostic codes, sensor testing, actuator testing, ECU programming (may require specific tools) Installation Replacement: Component removal and installation procedures for all major systems Technical Depth Depth: Comprehensive, covering basic maintenance to full engine and transmission rebuilds 📊 Manual Specifications File Format Searchability: Likely text-searchable PDF, enabling quick information retrieval Printability: Printable pages, allowing for physical reference Version: Digital (PDF) Print Quality Quality: Digital resolution typically high, ensuring clarity of diagrams and text Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally Opposed (Boxer) 4-Cylinder, turbocharged and intercooled Displacement: 2457 cc (2.5 Liters) Bore X Stroke: 99.5 mm x 80.0 mm Compression Ratio: 8.2:1 Engine Management: Multi-point fuel injection with Subaru Engine Management System (EMS) Performance Horsepower: 305 hp @ 6000 rpm (USDM) Torque: 290 lb-ft @ 4000 rpm (USDM) Fuel System Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Fuel Delivery: Electronic Fuel Injection (EFI) Ignition System: Electronic ignition with individual coil-on-plug 🔧 Transmission Standard Type: 6-speed manual transmission (TY85) Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver-Controlled Center Differential (DCCD) Optional Type: N/A (Only manual transmission offered for STI in this generation) Features Dccd Modes: Auto, Manual (6 settings for front/rear torque bias) Differentials: Helical Limited Slip Front Differential, Viscous Center Coupling, Torsen Limited Slip Rear Differential Fluid Specifications Manual Transmission Fluid: Subaru Extra-S (or equivalent API GL-5, SAE 75W-90) for transmission and front/rear differentials 📐 Dimensions Exterior Length: 4415 mm (173.8 in) Width: 1795 mm (70.7 in) Height: 1475 mm (58.1 in) Wheelbase: 2625 mm (103.3 in) Track Front: 1530 mm (60.2 in) Track Rear: 1540 mm (60.6 in) Wheel Bolt Pattern: 5 x 114.3 mm (5x4.5 inch) Weights Curb Weight: Approximately 1505 kg (3318 lbs) Gross Vehicle Weight Rating: Approx. 1950 kg (4300 lbs) 🛡️ Safety Features Ratings NHTSA Front Crash: 5 Stars NHTSA Side Crash: 5 Stars NHTSA Rollover: 4 Stars Active Features ABS: Anti-lock Braking System with Electronic Brake-force Distribution (EBD) Traction Control: Vehicle Dynamics Control (VDC) Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, curtain airbags (front and rear), driver's knee airbag Seatbelts: 3-point seatbelts with pretensioners and load limiters for all seating positions Body Structure: High-tensile strength steel body structure 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD with MP3 capability, available premium audio system (e.g., JBL) Display: Multi-information display in instrument cluster, potentially a basic central display for audio/climate Driver Assistance Cruise Control: Standard cruise control Si Drive: Subaru Intelligent Drive system allowing driver to select between Intelligent, Sport, and Sport Sharp modes, affecting throttle response, engine mapping, and VDC behavior. Connectivity Auxiliary Input: Standard auxiliary audio input jack Bluetooth: Optional Bluetooth hands-free connectivity and audio streaming 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe duty) / 7,500 miles or 12 months (normal duty) - Check owner's manual for specific recommendations 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...