🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2007 Codes Chassis Code: GDB Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Description: The 2007 WRX STI represented the pinnacle of Subaru's rally-bred performance offerings for the Impreza line, known for its potent turbocharged engine, advanced all-wheel-drive system, and driver-focused dynamics. Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Honda Civic Si, Volkswagen GTI Key Features Performance Focus: Emphasis on turbocharged engine power, precise handling, and all-weather capability. Rally Heritage: Direct lineage from Subaru's dominant World Rally Championship (WRC) program. AWD System: Advanced Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD). 📋 Manual Details Coverage Areas Covered Models: All 2007 Subaru Impreza WRX STI models Covered Regions: Global (with potential regional variations noted in manual) Page Count Estimated Pages: 1500+ Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Powertrain: Engine (EJ257), Transmission (6-speed manual), Drivetrain (Symmetrical AWD) Chassis: Suspension, Steering, Brakes, Wheels, Tires Electrical: Wiring Diagrams, ECU, Lighting, Audio, Accessories, Immobilizer Body: Body Panels, Interior Trim, Seating, Glass, Doors, Bumpers Comfort And Climate: HVAC System, Climate Control Procedures Included Maintenance: Oil Changes, Filter Replacements, Spark Plug Service, Fluid Flushes Troubleshooting: Diagnostic Codes (DTCs), Symptom-based Diagnostics, Electrical Fault Finding Repair: Engine Overhaul, Transmission Rebuild, Brake Component Replacement, Suspension Overhaul Adjustment: Wheel Alignment, Clutch Adjustment, Handbrake Adjustment Installation: Component Replacement, Accessory Installation Technical Depth Depth: Comprehensive, covering routine maintenance to full engine and transmission rebuilds Diagnostic Level: Advanced diagnostic procedures, including ECU scanning and electrical system analysis Specifications: Detailed torque specifications, clearances, fluid capacities, and resistance values 📊 Manual Specifications File Format File Type: PDF Searchable: Yes (text-searchable) Printable: Yes Print Quality Quality: High-resolution, clear diagrams and text Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2.5L Boxer Turbocharged DOHC 16-Valve Engine Code: EJ257 Performance Horsepower: 305 hp @ 6000 rpm (approx.) Torque: 290 lb-ft @ 4000 rpm (approx.) Fuel System Fuel Delivery: Sequential Electronic Fuel Injection (SEFI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Cooling System Coolant Capacity: 7.1 Liters (7.5 US Quarts) Lubrication System Oil Capacity: 4.8 Liters (5.1 US Quarts) with filter Turbocharger Turbo Model: IHI VF39 🔧 Transmission Standard Transmission Type: 6-speed Manual Optional Optional Transmissions: None (Manual Only for STI) Features Dccd: Driver Controlled Center Differential (manual operation) Fluid Specs Manual Transmission Fluid: Subaru Extra S Manual Transmission Fluid (or equivalent) Fluid Capacity Manual Transmission Capacity: 2.5 Liters (2.6 US Quarts) 📐 Dimensions Exterior Wheelbase: 2625 mm (103.3 in) Length: 4415 mm (173.8 in) Width: 1795 mm (70.7 in) Height: 1440 mm (56.7 in) Weights Curb Weight: 1480 kg (3263 lbs) Gross Vehicle Weight Rating: 1950 kg (4299 lbs) Cargo Trunk Volume: Approx. 386 Liters (13.6 cu ft) - Sedan 🛡️ Safety Features Ratings NHTSA Front Impact: Not Rated IIHS Front Impact: Good Active Features ABS: Yes (4-wheel anti-lock braking system) Traction Control: Yes (Subaru Vehicle Dynamics Control - VDC) Brake Assist: Yes Passive Features Airbags: Driver and Front Passenger Airbags, Side Curtain Airbags (optional/specific trims) Seatbelts: 3-point front and rear seatbelts with pretensioners Chassis Features Frame Construction: Reinforced chassis with crumple zones 💡 Technology Features Infotainment Head Unit: Factory AM/FM/CD Player with optional subwoofer Display: Digital clock and basic information display Driver Assistance Stability Control: Subaru Vehicle Dynamics Control (VDC) AWD System: Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) Connectivity Auxiliary Input: Optional (check specific vehicle) Gauge Cluster Instrumentation: Tachometer, Speedometer, Boost Gauge, Oil Pressure Gauge, Ancillary Gauges 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe driving conditions recommend more frequent changes) Spark Plug Replacement: Refer to manual, typically around 30,000 - 60,000 miles depending on type. Timing Belt Replacement: Not Applicable (EJ257 uses a timing chain or rubber belt, check manual for specific interval) Fluid Specifications Engine Oil Type: SAE 0W-30 or 5W-30 Synthetic (API SG, SH, SJ, SL, or SM) Coolant Type: Subaru Super Coolant (Blue) or equivalent Brake Fluid Type: DOT 3 or DOT 4 Known Issues Head Gasket Failures: While less common on the EJ257 than some earlier EJ25 variants, head gasket issues can still occur due to high thermal stress. Ring Land Cracking: Potential for piston ring land cracking under extreme detonation or sustained high boost. Clutch Wear: High-performance nature and repeated hard launches can lead to accelerated clutch wear. Turbo Charger Issues: Oil starvation or contamination can lead to premature turbo failure (IHI VF39). Recommended Parts Oil Filter Part Number: Subaru 15208AA031 (or equivalent such as FRAM PH7317, WIX 57356) 📚 Vehicle History Brand Heritage Rally Success: Subaru's long and successful history in the World Rally Championship (WRC) heavily influenced the WRX STI models. Model Evolution Generation: Third Generation Impreza (GE/GH/GR/GV) -...