🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI RS Year: 2006 Platform Code: GD/GG Chassis Code: GDB (specific to STI) 👋 Introduction Market Position Vehicle Segment: Compact Performance Sedan/Wagon (A-Segment) Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus ST, Mazdaspeed3 Key Features Drivetrain: Symmetrical All-Wheel Drive (AWD) system, Driver Controlled Center Differential (DCCD) on STI models Performance Focus: Tuned for rally-inspired performance, handling, and responsiveness. Value Proposition Manual Benefit: Cost-effective solution for maintaining and repairing the vehicle, enabling DIY enthusiasts and professional mechanics to perform accurate work. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Diagnostics Included Models: RS, WRX, WRX STI Page Count Estimated Pages: Thousands (typical factory service manual scope) Manual Type Type: Complete Factory Service Repair Manual Language Language: English Format Delivery Method: Digital Download (Software Platform) 📖 Manual Coverage Systems Covered Powertrain: Engine (all variants), Transmission (Manual, Automatic), Drivetrain (AWD system, differentials, driveshafts) Chassis: Suspension (front and rear), Steering, Brakes (including ABS and parking brake), Wheels and Tires Electrical: Engine Control System, Starting & Charging, Lighting, Instrumentation, Audio/Visual, HVAC, Power Accessories, Supplemental Restraint System (SRS), Immobilizer, Cruise Control, Multiplex/CAN Communication Body: Exterior panels, Doors, Hood, Glass, Mirrors, Interior trim, Seats, Restraint systems Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, belt inspections/replacements Diagnostics: Troubleshooting charts, DTC (Diagnostic Trouble Code) lookup and procedures, sensor testing, component testing Repair: Component removal, installation, adjustment, rebuild procedures for engine, transmission, suspension, brakes, electrical systems Technical Specifications: Torque specifications, clearances, fluid capacities, electrical schematics, wiring diagrams Technical Depth Depth: Comprehensive, from basic fluid checks to complete engine and transmission rebuilds, including advanced diagnostic procedures. 📊 Manual Specifications File Format Digital Format: Interactive CD Platform Software (Windows, Macintosh, Linux Compatible) Print Quality Printability: High-definition, printable instructions and illustrations. Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) Content Features Illustrations: Diagrams with photographs, color and B/W illustrations. Searchability: Fully indexed by bookmarks and keywords. Authenticity Origin: Genuine Subaru Factory Original ⚙️ Engine Specifications Primary Engine Engine Type: EJ257 (STI), EJ255 (WRX) Displacement: 2.5 Liters (2457cc) Configuration: Horizontally Opposed 4-Cylinder (Boxer) Aspiration: Turbocharged and Intercooled Valvetrain: DOHC (Dual Overhead Camshafts), 16 Valves Performance Horsepower Sti: 300 hp @ 6000 rpm (approx.) Torque Sti: 300 lb-ft @ 4000 rpm (approx.) Horsepower Wrx: 230 hp @ 5600 rpm (approx.) Torque Wrx: 235 lb-ft @ 3600 rpm (approx.) Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI) Fuel Type: Unleaded gasoline, premium (91+ octane recommended) 🔧 Transmission Standard Type: 6-speed Manual Transmission (STI), 5-speed Manual Transmission (WRX) Optional Type: 4-speed Automatic Transmission (less common on STI, available on WRX) Features Sti Features: Driver Controlled Center Differential (DCCD), limited-slip rear differential Fluid Specs Manual Transmission Fluid Sti: Subaru Extra Gear Oil API GL-5, SAE 75W-90 (or equivalent) Automatic Transmission Fluid: Subaru ATF HP (or equivalent) 📐 Dimensions Exterior Wheelbase: 103.1 inches (2619 mm) Length: 173.8 inches (4415 mm) Width: 69.7 inches (1770 mm) Height: 57.9 inches (1470 mm) for Sedan, 56.1 inches (1425 mm) for Wagon Weights Curb Weight Sti: 3285 lbs (1490 kg) approx. Curb Weight Wrx: 3131 lbs (1420 kg) approx. Wheel Bolt Pattern: 5x100mm Wheel Size Sti: 17x8.0 or 18x8.0 inches Tire Size Sti: 225/45R17 or 225/40R18 Wheel Size Wrx: 17x7.0 inches Tire Size Wrx: 215/45R17 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (2006 model) IIHS Side Impact: Good (2006 model) Active Features AWD: Symmetrical All-Wheel Drive standard on all trims Brakes: Front: Ventilated Discs, Rear: Solid Discs (STI features larger, performance-tuned brakes) ABS: Anti-lock Braking System standard Passive Features Airbags: Frontal, Side, Curtain Airbags Seat Belts: Pretensioners, Force Limiters Immobilizer: Engine Immobilizer system 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD player, optional premium audio systems available. Display: Basic digital clock/display, no integrated navigation for this model year. Driver Assistance Traction Control: Subaru Vehicle Dynamics Control (VDC) available on some models. Cruise Control: Standard cruise control system. Connectivity Auxiliary Input: Standard 3.5mm auxiliary audio input jack available on some trims. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months, or 7,500 miles/12 months with synthetic oil and filter, depending on driving conditions (refer to manual for specifics). Timing Belt Replacement: Approximately every 105,000 miles or 105 months (for EJ25 engine, consult manual for precise interval and related components like water pump). Coolant Flush Interval: Every 30,000 miles or 30 months (Subaru Super Coolant) Fluid Specifications Engine Oil Type: SAE 5W-30 (synthetic recommended for performance models) Coolant Type: Subaru Super Coolant (Blue) Brake Fluid Type: DOT 3 or DOT 4 Power Steering Fluid: Subaru Genuine ATF or Dexron III compatible fluid Known Issues Ring Land Failure: Common on EJ25 engines, especially when pushed hard or with improper tuning/maintenance. Manual provides diagnostic steps. Clutch Wear: High-performance driving can accelerate clutch wear. Manual covers clutch inspection and replacement. Headgasket Leaks:...