🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2007 Generation Generation Code: GD/GG (Third Generation) Codes Chassis Code: GDB 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Competitors: Mitsubishi Lancer Evolution, Honda Civic Si, Volkswagen GTI, Mazdaspeed3. Brand Perception: Known for its rally heritage, all-wheel-drive system, turbocharged performance, and driver engagement. Key Features Drivetrain: Symmetrical All-Wheel Drive (SAWD) with Driver Controlled Center Differential (DCCD). Engine: 2.5L turbocharged Boxer engine (EJ257). Transmission: 6-speed manual transmission. Brakes: Brembo front and rear brake system. Suspension: Performance-tuned independent suspension. 📋 Manual Details Coverage Areas Manual Type: Service Repair Manual Language: English Format: PDF Download Page Count: Approximately 3000+ pages (typical for comprehensive factory service manuals of this era) 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed overhaul and repair procedures for EJ257 engine, including short block, cylinder heads, valvetrain, pistons, connecting rods, crankshaft, timing belt, oil pump, cooling system. Engine Management: ECU diagnosis, fuel injection system, ignition system, emissions control systems (EVAP, secondary air injection), sensor and actuator testing, wiring diagrams. Transmission: 6-speed manual transmission (TY856WB1CA) overhaul, clutch system, gear selection mechanism, driveline components (driveshafts, differentials). Suspension: Front and rear suspension systems, struts, springs, control arms, sway bars, bushings, wheel alignment procedures. Brakes: Front and rear brake systems (Brembo calipers standard on STI), ABS, EBD, brake rotor/pad replacement, caliper overhaul, brake fluid bleeding. Steering: Power steering system, steering rack, steering column, alignment. Electrical: Complete electrical system, battery, charging system, starter, lighting, power windows, locks, mirrors, audio system, SRS airbag system, body control modules, comprehensive wiring diagrams. Body: Body panel removal and installation, exterior trim, doors, hood, trunk, bumpers, interior trim, seats, HVAC system, diagnosis and repair of body electrical components. HVAC: Air conditioning system, heater, climate control, refrigerant handling, component testing and replacement. Safety Systems: Airbag system diagnosis and service, seat belt mechanisms. Procedures Included Maintenance: Scheduled maintenance procedures, fluid changes (engine oil, coolant, transmission fluid, brake fluid, differential fluid), filter replacements, spark plug replacement, belt inspection/replacement. Diagnostics: Troubleshooting guides based on symptoms, diagnostic trouble codes (DTCs), on-board diagnostics (OBD-II) interpretation, component testing procedures. Repair: Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation for all major vehicle systems. Overhaul: Complete engine and transmission overhaul procedures, including torque specifications, clearances, and critical assembly data. Adjustment: Clutch adjustment, parking brake adjustment, idle speed adjustment (if applicable), suspension alignment. Calibration: ECU relearn procedures, idle air control (IAC) valve relearn, throttle body relearn. Technical Depth Depth: Comprehensive. Covers everything from routine maintenance and diagnostics to complete engine and transmission rebuilds, detailed electrical schematics, and bodywork repair. Target Audience: Professional technicians and experienced DIY mechanics. 📊 Manual Specifications File Format Format: PDF Searchable: Likely yes, if properly indexed Printable: Yes Quality: High resolution scans, typically mirroring factory publications. Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: Horizontally-opposed (Boxer), turbocharged, intercooled, DOHC, 16-valve. Displacement: 2.5 Liters (2457 cc) Performance Horsepower: 305 hp @ 6000 rpm (JDM/Euro), 293 hp @ 6000 rpm (USDM) Torque: 290 lb-ft @ 4000 rpm (JDM/Euro), 287 lb-ft @ 4000 rpm (USDM) Fuel System Fuel Delivery: Multi-point fuel injection (MPI), sequential. Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Turbocharger: IHI VF39 (USDM), VF36 (JDM/Euro) Intercooler: Top-mount, air-to-air. 🔧 Transmission Standard Type: 6-speed Manual (TY856WB1CA) Optional Type: N/A (STI models were exclusively manual) Features Dccd: Driver Controlled Center Differential (electronic and manual modes). Differentials: Front: Helical limited-slip differential. Rear: Viscous coupling limited-slip differential. 📐 Dimensions Exterior Length: 174.7 inches (4435 mm) Width: 69.7 inches (1770 mm) Height: 57.7 inches (1465 mm) Wheelbase: 104.9 inches (2665 mm) Track Width Front: 59.1 inches (1500 mm) Track Width Rear: 59.3 inches (1505 mm) Ground Clearance: 5.5 inches (140 mm) Wheel Bolt Pattern: 5x114.3 mm (5x4.5 inches) Wheel Size: 17 x 8.0 inches (standard), 18 x 8.5 inches (optional/STI) Tire Size: 225/45R17 (standard), 235/40R18 (STI) Weights Curb Weight: Approximately 3200-3300 lbs (1450-1500 kg) Gross Vehicle Weight Rating: Not specified, but typically around 4300 lbs. 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5-Star (2007 Impreza Sedan) NHTSA Side Crash Test: 5-Star (2007 Impreza Sedan) IIHS Front Crash Test: Good (2007 Impreza Sedan) IIHS Side Crash Test: Good (2007 Impreza Sedan) Active Features ABS: Standard, 4-wheel Anti-lock Braking System. Ebd: Standard, Electronic Brake-force Distribution. Traction Control: Standard, with DCCD and AWD system integration. Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, side-curtain airbags (sedan). Seatbelts: 3-point height-adjustable front seatbelts with pre-tensioners, 3-point rear seatbelts. Child Anchors: LATCH (Lower Anchors and Tethers for Children) system. 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD player with optional subwoofer and amplifier. Display: Minimal dashboard display for audio, clock, and basic vehicle information. Driver Assistance Cruise Control: Standard. Limited Slip Differentials: Advanced mechanical and electronic LSDs (DCCD, front helical, rear viscous) are...