🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2005 Codes Chassis Code: GDB Generation Generation: GD (Second Generation) 👋 Introduction Market Position Market Position: The 2005 Subaru Impreza WRX STI (GDB generation) occupied a niche as a highly capable, rally-bred performance sedan and hatchback, appealing to driving enthusiasts seeking all-wheel-drive grip, turbocharged power, and a direct connection to the road. It competed against performance variants of cars like the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, and Ford Focus RS. Competitive Analysis Competitive Analysis: The STI distinguished itself with its Subaru Boxer engine's characteristic sound and low center of gravity, advanced DCCD (Driver Controlled Center Differential), strong aftermarket support, and its lineage from WRC success. Its AWD system provided superior traction in various conditions compared to many front-wheel-drive rivals. Key Features Key Features: Turbocharged EJ257 Boxer engine, symmetrical all-wheel drive with DCCD, performance-tuned suspension, large Brembo brakes, aggressive styling, sport seats, 6-speed manual transmission, rally heritage. 📋 Manual Details Coverage Areas Coverage Areas: Engine (STi, H4SO, H4DOTC variants), Transmission, Chassis, Body, Wiring, Mechanisms, Functions Page Count Page Count: Estimated 2000-3000+ pages (typical for a comprehensive factory service manual) Manual Type Manual Type: Factory Service Manual / Repair Manual Language Language: English Format Format: Digital (likely PDF, as specified by typical product listings) 📖 Manual Coverage Systems Covered Systems Covered: Engine mechanical (EJ257), engine control system (ECU, sensors, actuators), fuel system, ignition system, cooling system, lubrication system, exhaust system, transmission (6-speed manual), drivetrain components (differentials, driveshafts, axles), suspension system (front/rear), steering system, braking system (including ABS), chassis components, body panels and structure, electrical system (wiring diagrams, components, fuses, relays), HVAC system, interior trim, exterior trim, wheels and tires, diagnostic procedures, emissions control system, torque specifications, special tools Procedures Included Procedures Included: Routine maintenance (oil changes, filter replacements, fluid checks), component inspection, troubleshooting guides, diagnostic routines, disassembly and reassembly of engine components, transmission overhaul, suspension component replacement, brake system service, steering system repair, electrical system diagnosis and repair, bodywork repair, body panel alignment, interior component removal and installation, wiring harness repair, exhaust system repair, HVAC system servicing, torque wrench applications, specialized tool usage, component testing, specifications for alignment, wheel balancing, and engine performance adjustments Technical Depth Technical Depth: Comprehensive, covering everything from basic preventative maintenance to complex internal engine and transmission rebuilds, advanced electrical diagnostics, and detailed body repair. Designed for professional technicians but accessible to advanced DIY enthusiasts. 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) Print Quality Print Quality: High-resolution scanned pages, optimized for clarity and readability on screen and when printed. May include searchable text if OCR processed. Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Primary Engine: EJ257 Engine Type Engine Type: Horizontally Opposed (Boxer), 4-Cylinder, 16-Valve, DOHC Displacement Displacement: 2.5 Liters (2457 cc) Bore X Stroke Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio Compression Ratio: 8.0:1 Turbocharger Turbocharger: IHI VF39 (Ball Bearing) Intercooler Intercooler: Top-mounted Air-to-Air Horsepower Horsepower: 300 hp @ 6000 rpm Torque Torque: 300 lb-ft @ 4000 rpm Fuel System Fuel System: Multi-Point Fuel Injection (MPI) with Sequential Fuel Delivery Fuel Type Fuel Type: Premium Unleaded Gasoline (91 Octane or higher recommended) Engine Cooling Engine Cooling: Pressurized Liquid Cooling System Ignition System Ignition System: Electronic Ignition, Distributorless (Coil-on-Plug) 🔧 Transmission Standard Standard Transmission: 6-Speed Manual Transmission Optional Optional Transmission: N/A for STI trim Drivetrain Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Clutch Clutch Type: Hydraulically Actuated, Single Dry Plate Fluid Type Transmission Fluid Type: Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent API GL-5 specification Fluid Capacity Transmission Fluid Capacity: Approx. 2.6 US quarts (2.5 Liters) 📐 Dimensions Exterior Overall Length: 173.4 inches (4405 mm) Overall Width: 69.7 inches (1770 mm) Overall Height: 57.7 inches (1465 mm) Wheelbase: 101.4 inches (2575 mm) Front Track: 59.3 inches (1505 mm) Rear Track: 59.1 inches (1500 mm) Weights Curb Weight: 3263 lbs (1480 kg) Gross Vehicle Weight Rating: 4365 lbs (1980 kg) Cargo Trunk Capacity: 11.4 cu ft (Sedan) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (Driver and Passenger) NHTSA Side Impact: 4-Star (Front and Rear Passengers) IIHS Front Crash: Good Active Features Active Features: Anti-lock Braking System (ABS), Electronic Brakeforce Distribution (EBD), Brake Assist, Traction Control System (TCS), Advanced All-Wheel Drive with DCCD, Limited-Slip Front Differential, Helical Limited-Slip Rear Differential. Passive Features Passive Features: Front-impact airbags (driver and passenger), front side-impact airbags, front and rear head curtain airbags (optional/standard depending on market), crumple zones, energy-absorbing steering column, side-impact door beams, 3-point seatbelts with pretensioners, LATCH child seat anchors. 💡 Technology Features Infotainment Infotainment System: Basic factory audio system (CD player, radio), often with optional premium sound system. Limited connectivity by modern standards; typically no Bluetooth or USB standard. Driver Assistance Driver Assistance: Driver...