🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STi Year: 2004 Generation Generation: GD/GG (Second Generation) Codes Chassis Code: GDB Engine Code Primary: EJ257 👋 Introduction Market Position Positioning: Performance rally homologation special, enthusiast vehicle Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Honda Civic Type R Key Features Performance Focus: Symmetrical All-Wheel Drive, turbocharged Boxer engine, driver-focused chassis Value Proposition: Comprehensive repair and maintenance guidance for a highly specialized performance vehicle 📋 Manual Details Coverage Areas Coverage: All Models & Repairs A-Z (Mechanical & Electrical) Page Count Estimated Page Count: Extensive (typically 1000+ pages for a full workshop manual) Manual Type Manual Type: Workshop Service Repair Manual Language Language: English Format Format: Digital (Printable Pages, likely PDF) 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel, ignition, emissions, turbocharger system Transmission: Manual transmission (TY856WR1CA), clutch, driveline, differentials (front, center, rear) Brakes: Front and rear brake systems, ABS, parking brake Suspension Steering: Front and rear suspension, steering system, power steering Electrical: Wiring diagrams, charging system, starting system, lighting, instruments, power accessories, ECU and sensor diagnostics Body Chassis: Body construction, exterior trim, interior trim, safety systems (airbags) Procedures Included Maintenance: Routine maintenance, fluid changes, filter replacements, tune-ups Repair Overhaul: Engine rebuild, transmission overhaul, suspension component replacement, brake system repair Diagnostics: Troubleshooting guides, symptom-based diagnostics, DTC (Diagnostic Trouble Code) interpretation Installation: Component installation and removal procedures Technical Depth Depth: Comprehensive from basic maintenance to advanced engine and electrical diagnostics and repair 📊 Manual Specifications File Format Digital Format: PDF (assumed, common for workshop manuals), Searchable Text (likely) Print Quality Printability: All pages printable Image Quality: High-quality detailed pictures and diagrams Binding Type Binding: N/A (Digital Product) Paper Type Paper Type: N/A (Digital Product) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally-opposed (Boxer) turbocharged inline-4 Displacement: 2.0 Liters (1994 cc) Bore X Stroke: 92.0 mm x 75.0 mm Compression Ratio: 8.0:1 Performance Horsepower: 265 hp @ 6000 rpm (US Spec) Torque: 253 lb-ft @ 4000 rpm (US Spec) Fuel System Fuel Injection: Multi-point Electronic Fuel Injection (MPI) Fuel Type: Unleaded Premium Gasoline (91+ octane recommended) Turbocharger Turbocharger Model: IHI VF37 (twin-scroll) Intercooler Type: Air-to-air top-mount 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission Model: TY856WR1CA Optional Optional Transmission: None available for WRX STi Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Differential Ratios: Front: 3.55, Rear: 3.55 (typical) 📐 Dimensions Exterior Length: 173.8 inches Width: 69.7 inches Height: 56.1 inches Wheelbase: 103.7 inches Front Track: 59.1 inches Rear Track: 58.7 inches Weights Curb Weight: 3263 lbs (approx.) Gross Vehicle Weight Rating: 4409 lbs (approx.) Cargo Cargo Volume: 11.0 cu ft (sedan) 🛡️ Safety Features Ratings NHTSA Front Crash Rating: 4/5 Stars NHTSA Side Crash Rating: 5/5 Stars IIHS Roof Strength: Good Active Features ABS: Standard Anti-lock Braking System (4-wheel disc) Traction Control: Standard (part of AWD system) Electronic Brake Force Distribution: Standard (EBD) Passive Features Airbags Front: Driver and front passenger airbags Airbags Side: Optional front side-impact airbags Seatbelts: 3-point height-adjustable front seatbelts with pretensioners, 3-point rear seatbelts 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD player (basic) Speakers: Standard speaker system Driver Assistance ABS: Standard AWD: Standard Symmetrical All-Wheel Drive with DCCD Connectivity Connectivity Features: Limited by era; typically basic audio inputs. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 3 months (severe duty) or 7,500 miles or 6 months (normal duty) Air Filter Replacement: Every 15,000 miles or 12 months Spark Plug Replacement: Every 30,000 miles (platinum type) Coolant Replacement: Every 30,000 miles or 24 months Fluid Specifications Engine Oil Type: Synthetic 5W-30 API SG or higher (check owner's manual for precise specs) Engine Oil Capacity: 4.8 US quarts (with filter) Transmission Fluid Type: Subaru Extra-S or equivalent API GL-5 (manual transmission) Differential Fluid Type: Subaru Extra-S or equivalent API GL-5 (front and rear) Coolant Type: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant Known Issues Engine Failures: Head gasket failures (less common on EJ257 than earlier EJ25), ringland failures due to detonation, turbocharger wear Clutch Wear: Clutch can wear prematurely with aggressive driving Suspension Components: Sway bar links, bushings, and wheel bearings can wear over time Part Numbers Oil Filter Oem: 15208AA100 (example, verify for specific VIN) Air Filter Oem: 16546AA120 (example, verify for specific VIN) 📚 Vehicle History Brand Heritage Brand Focus: Subaru is renowned for its Symmetrical All-Wheel Drive system and horizontally-opposed Boxer engines. Model Evolution Wrx Sti Lineage: The WRX STi is a homologation special derived from Subaru's World Rally Championship (WRC) program, emphasizing performance and rally-bred technology. Gd Gg Generation: The 2004 model year is part of the second generation (GD/GG), which saw significant styling updates and performance enhancements compared to the first generation. Production Production Years: 2002-2007 (GD/GG generation) Manufacturing Location: Japan 🏆 Awards & Recognition Recognitions Car And Driver Best: Included on...