🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2006 Model Code: GDB Generation Generation Name: Third Generation (GD) Generation Years: 2000-2007 Codes Chassis Code: GDB-F (specific to 2006-2007 model updates) 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Reputation: Iconic rally-bred performance car, known for all-wheel drive and turbocharged power Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI Key Features Performance Focus: Engineered for performance driving, rallying heritage AWD System: Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) Engine Type: Turbocharged Boxer engine Transmission: Standard 6-speed manual transmission 📋 Manual Details Coverage Areas Primary Coverage: Mechanical, Electrical, Body, Maintenance, Diagnostics Secondary Coverage: Troubleshooting, Wiring Diagrams, Specifications Page Count Estimated Page Count: 1500+ Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, block, lubrication system, cooling system, timing system Engine Performance: Turbocharger system, intercooler, fuel injection, ignition system, emissions control Transmission: 6-speed manual transmission (TY856WB1AA), clutch system, drivetrain (front/rear differentials, DCCD) Brakes: Front and rear brake systems, ABS, parking brake Suspension: Front and rear suspension components, alignment specifications Steering: Power steering system, steering column Electrical: Battery, charging system, starting system, lighting, instruments, accessories, body electrical control units Body: Body structure, exterior panels, interior trim, doors, glass, HVAC system Chassis Electrical: Wiring diagrams, connector pinouts, fuse and relay locations Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication points Repair: Component disassembly and reassembly, component testing and replacement Diagnostics: Troubleshooting charts, symptom analysis, diagnostic trouble codes (DTCs) Adjustments: Alignment, clutch, brake adjustments Installation: Major component replacement procedures Technical Depth Depth: Comprehensive; covers basic to advanced repairs and diagnostics Diagnostic Tools: Detailed diagnostic procedures, including use of Subaru Select Monitor (SSM) if applicable 📊 Manual Specifications File Format File Type: PDF Searchable: Yes (typically) Print Quality Quality: High-resolution scans of original factory documents Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L DOHC Turbocharged Boxer-4 Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.0:1 Displacement: 2457 cc Performance Horsepower: 300 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI) Recommended Fuel: Premium Unleaded Gasoline (91+ Octane) Fuel Tank Capacity: 15.1 gallons (57 liters) 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission Model: TY856WB1AA Optional Optional Transmission: N/A (STI models exclusively manual) Features AWD System: Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) Dccd Modes: Manual and Automatic modes for center differential lockup Rear Differential: Viscous-coupling Limited-Slip Differential (VLSD) 📐 Dimensions Exterior Length: 173.4 inches (4404 mm) Width: 69.7 inches (1770 mm) Height: 57.7 inches (1465 mm) Wheelbase: 103.1 inches (2619 mm) Ground Clearance: 5.5 inches (140 mm) Weights Curb Weight: Approx. 3285 lbs (1490 kg) Gross Vehicle Weight Rating: Approx. 4355 lbs (1975 kg) Cargo Trunk Capacity: 11.3 cu ft (320 liters) (Sedan), Varies by model (Wagon) 🛡️ Safety Features Ratings NHTSA Front Impact: Not rated or Not Applicable for this specific variant/year in all testing categories IIHS Front Impact: Good (for similar Impreza models of the era) Active Features ABS: Standard Anti-lock Braking System Traction Control: Standard Electronic Stability Control: Not standard on all 2006 WRX STI models, but available or standard on later GD generations. Passive Features Airbags: Front airbags, front side-impact airbags Seatbelts: 3-point front and rear seatbelts with pretensioners Crumple Zones: Front and rear crumple zones for energy absorption 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD player with upgraded speaker system Navigation: Optional factory navigation system Driver Assistance Cruise Control: Standard Connectivity Auxiliary Input: Optional auxiliary input jack 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 3 months (severe use), 7,500 miles or 6 months (normal use) Air Filter Replacement: Every 15,000 miles or 12 months Spark Plug Replacement: Every 30,000-60,000 miles (depending on plug type) Timing Belt Replacement: Every 60,000 miles or 5 years (if applicable, check for interference engine design) Fluid Specifications Engine Oil Type: SAE 5W-30 Synthetic (check manual for exact spec, e.g., API SM or higher) Engine Oil Capacity: Approx. 4.8 US quarts (4.5 liters) with filter Coolant Type: Subaru Super Coolant (Blue) or equivalent silicate-free antifreeze Transmission Fluid Type: GL-4 or GL-5 Gear Oil (e.g., Subaru Extra-S or equivalent) Transmission Fluid Capacity: Approx. 3.3 US quarts (3.1 liters) Differential Fluid Type: GL-5 Gear Oil (Front and Rear) Brake Fluid Type: DOT 3 or DOT 4 Brake Fluid Known Issues Engine Knock: Potential for detonation/knocking if not properly maintained or if using low-octane fuel. Ringland Failure: Can occur in EJ257 engines under high stress or with improper tuning/maintenance. Clutch Wear: High-performance clutch can wear faster with aggressive driving. Head Gasket Leaks: While less common on EJ257 than...