🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2006 Chassis Code: GDB Market Segment: Performance Compact Sedan/Wagon 👋 Introduction Market Position Positioning: The 2006 Impreza WRX STI represents the pinnacle of Subaru's rally-bred performance in the compact segment, targeting enthusiasts seeking a potent AWD platform with exceptional handling. Competitive Analysis Competitors: Competes directly with performance variants like the Mitsubishi Lancer Evolution, Honda Civic Type R, and Volkswagen Golf GTI of its era. Key Features Performance Focus: Emphasis on turbocharged power, advanced all-wheel drive, and track-tuned suspension. Rally Heritage: Direct lineage from Subaru's successful World Rally Championship (WRC) efforts. 📋 Manual Details Coverage Coverage Areas: All Models, All Engines, All Trims Format Format: PDF Download Type Manual Type: Workshop Repair Service Manual Language Language: English 📖 Manual Coverage Systems Engine: Comprehensive coverage of the EJ257 engine (2.5L Turbocharged Boxer) Transmission: 6-speed manual transmission (TY856) repair and maintenance Drivetrain: All-Wheel Drive (AWD) system, differentials (front, center, rear), DCCD (Driver Controlled Center Differential) operation and adjustment Suspension: Front MacPherson strut, rear multi-link suspension, springs, dampers, bushings, alignment specifications Brakes: Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ABS system, brake fluid specifications and bleeding procedures Electrical: Wiring diagrams, component locations, diagnostic procedures for ECUs, sensors, lighting, audio, and HVAC Body: Body panel repair, collision repair, door, hood, trunk, glass, and trim component service Procedures Routine Maintenance: Oil changes, filter replacements, spark plug service, fluid checks and replacements Troubleshooting: Diagnostic flowcharts, common fault codes, symptom-based troubleshooting for engine, transmission, and electrical systems Engine Repair: Engine assembly/disassembly, cylinder head service, piston and connecting rod installation, crankshaft bearing replacement Transmission Repair: Transmission disassembly, gear inspection and replacement, clutch service, driveshaft and CV joint service Suspension Steering: Strut and shock absorber replacement, control arm bush replacement, steering rack overhaul, wheel bearing replacement Brake System Repair: Brake pad and rotor replacement, caliper service, brake line repair, ABS sensor diagnostics Electrical Diagnostics: ECM/PCM diagnostic strategies, sensor testing, actuator testing, CAN bus communication troubleshooting Technical Depth Depth: Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds 📊 Manual Specifications File File Format: PDF Searchability: Searchable text for quick information retrieval Printability: Printable pages for workshop use Digital Quality: High-resolution scans ensuring clarity of diagrams and text ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L (2457cc) DOHC 16-valve turbocharged boxer-four Performance Horsepower: 300 hp @ 6000 rpm (USDM) Torque: 290 lb-ft @ 4000 rpm (USDM) Fuel System Fuel Delivery: Multi-point fuel injection (MPI) with Denso 550cc fuel injectors Turbocharger: IHI VF37 twin-scroll turbocharger Cooling Intercooler: Top-mounted air-to-air intercooler Engine Management ECU: Denso Engine Control Unit (ECU) 🔧 Transmission Standard Type: 6-speed Manual Transmission Code: TY856 Optional Availability: Not applicable, manual transmission standard on WRX STI Features Dccd: Driver Controlled Center Differential (DCCD) for variable torque split Fluid Transmission Fluid Spec: Subaru Extra Syn Gear Oil (75W-90) or equivalent Transfer Case Fluid Spec: Subaru Extra Syn Gear Oil (75W-90) or equivalent 📐 Dimensions Exterior Length: 4,415 mm (173.8 in) Width: 1,740 mm (68.5 in) Height: 1,415 mm (55.7 in) Wheelbase: 2,625 mm (103.3 in) Ground Clearance: 135 mm (5.3 in) Weights Curb Weight: Approx. 1,470 kg (3,240 lbs) Cargo Trunk Volume: Approx. 11.0 cu ft (Sedan) Wheels Tires Wheel Size: 17 x 8.0 inches Tire Size: 225/45R17 Bolt Pattern: 5x100mm 🛡️ Safety Features Ratings NHTSA Frontal Crash: 4/5 stars (Driver/Passenger) NHTSA Side Impact: 4/5 stars (Front/Rear Passenger) Active Features ABS: Standard Anti-lock Braking System (ABS) E Brake: Electronic Brake Force Distribution (EBD) AWD: Symmetrical All-Wheel Drive (SAWD) with DCCD Passive Features Airbags: Driver and front passenger airbags, front side-impact airbags Seatbelts: Pre-tensioner seatbelts with force limiters Chassis: Ring-shaped reinforcement frame 💡 Technology Features Infotainment Audio System: Factory 6-disc CD changer with premium audio system Climate Control: Manual or automatic climate control depending on trim Driver Assistance Cruise Control: Standard cruise control Connectivity Bluetooth: Not standard, often an aftermarket addition 🔧 Maintenance Service Intervals Oil Change: Every 3,750 miles or 6 months, whichever comes first (severe duty) Air Filter: Replace every 15,000 miles or 12 months Spark Plugs: Replace every 30,000 miles (iridium) Coolant Flush: Every 30,000 miles or 24 months Fluid Specifications Engine Oil Spec: SAE 5W-30 (API SJ/SL or ILSAC GF-3) Coolant Type: Subaru Super Coolant (Blue) Brake Fluid Spec: DOT 3 Known Issues Ring Land Failure: Potential for ring land failure on pistons due to detonation, especially with aggressive tuning or poor fuel quality. Requires careful attention to engine management and detonation prevention. Clutch Wear: High-performance nature can lead to accelerated clutch wear with aggressive driving. Turbo Failure: IHI VF37 turbo can be susceptible to failure if oil starvation or excessive heat is present. Proper warm-up and cool-down procedures are critical. Head Gasket Leaks: While less common than on earlier EJ engines, can still occur, particularly if overheating incidents happen. 📚...