🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX & STI Year: 2006 Codes Chassis Code: GD/GG 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Target Audience: Enthusiast drivers, rally racing fans, owners seeking to perform their own maintenance and repairs. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R32. Key Features All Wheel Drive: Symmetrical All-Wheel Drive (AWD) system providing superior traction and handling. Turbocharged Engine: Legendary turbocharged boxer engines known for their unique sound and power delivery. Rally Heritage: Direct lineage from Subaru's successful World Rally Championship (WRC) cars. 📋 Manual Details Coverage Areas General Coverage: Comprehensive service and repair for 2006 Subaru Impreza WRX and STI models. Page Count Estimated Page Count: Over 2000 pages (typical for factory service manuals of this era and scope) Manual Type Type: Factory Service Repair Manual / Workshop Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, diagnosis, repair procedures, cylinder head, crankshaft, pistons, connecting rods, timing components. Engine Management: Fuel injection, ignition system, engine control module (ECM), sensors, actuators, emissions control, turbocharger system. Transmission: Manual transmission (TY756 family for WRX, TY856 for STI), clutch system, drivetrain components (driveshafts, differentials, axles). Suspension And Steering: Front and rear suspension components, shock absorbers, springs, control arms, steering gear, power steering system. Brakes: Brake system diagnosis, hydraulic components, ABS system, parking brake, brake pad and rotor replacement. Electrical System: Wiring diagrams, battery, alternator, starter motor, lighting system, power windows, power mirrors, horn, fuses, relays. HVAC System: Heating, ventilation, and air conditioning system components, diagnosis, and repair. Body And Interior: Exterior body panels, interior trim, seats, airbags, door mechanisms, glass replacement. Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, air filter replacement. Major Repairs: Engine rebuilding, transmission overhaul, suspension component replacement, brake caliper replacement. Troubleshooting: Diagnostic flowcharts, symptom-based troubleshooting for various systems. Diagnostics: OBD-II (On-Board Diagnostics) system, diagnostic trouble codes (DTCs), scan tool usage. Technical Depth Depth: Factory-level detail covering disassembly, assembly, specifications, torque values, clearances, and diagnostic procedures. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Print Quality Printability: High resolution, suitable for printing individual pages or the entire manual. Binding Type Binding Type: N/A (Digital Download - PDF) Paper Type Paper Type: N/A (Digital Download - PDF) ⚙️ Engine Specifications Primary Engine Wrx Engine: 2.5L EJ255 Turbocharged Boxer-4 Sti Engine: 2.5L EJ257 Turbocharged Boxer-4 (DBA-GRB chassis code variant) Performance Wrx Horsepower: 230 hp @ 5200 rpm Wrx Torque: 235 lb-ft @ 3200 rpm Sti Horsepower: 300 hp @ 6000 rpm Sti Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Type: Unleaded Gasoline (91+ octane recommended for optimal performance) Injection Type: Sequential Multi-Port Fuel Injection (SPI) Engine Management Ignition System: Distributorless Ignition System (DIS) with coil-on-plug 🔧 Transmission Standard Wrx Transmission Type: 5-speed Manual Sti Transmission Type: 6-speed Manual Optional Optional Transmission: None (Manual transmission was standard for WRX/STI models in 2006) Features Sti Driver Controlled Center Differential: Yes (DCCD - Driver Controlled Center Differential) Limited Slip Differentials: Yes (Front and Rear) 📐 Dimensions Exterior Wheelbase: 103.1 inches (2619 mm) Length: 173.8 inches (4415 mm) Width: 69.7 inches (1770 mm) Height: 56.1 inches (1425 mm) Weights Curb Weight Wrx: 3131 lbs (1420 kg) Curb Weight Sti: 3296 lbs (1495 kg) 🛡️ Safety Features Ratings NHTSA Front Impact Driver: 5 Stars NHTSA Front Impact Passenger: 5 Stars NHTSA Side Impact Front Driver: 5 Stars NHTSA Side Impact Front Passenger: 5 Stars NHTSA Side Impact Rear Driver: 4 Stars NHTSA Side Impact Rear Passenger: 4 Stars IIHS Front Offset Ld: Good Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Driver Controlled Center Differential (DCCD) on STI, Traction Control System (TCS) on WRX. Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, front and rear side curtain airbags. Seatbelts: 3-point front and rear seatbelts with pre-tensioners. 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with CD player, 4 or 6-speaker system depending on trim. Driver Assistance ABS: Standard Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD). Connectivity Cruise Control: Standard 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe service), 7,500 miles or 12 months (normal service) - consult manual for specific conditions. Engine Air Filter: Inspect every 15,000 miles, replace as needed. Spark Plugs: Replace every 30,000 miles for WRX (copper), 60,000 miles for STI (iridium - consult manual for exact type). Timing Belt: Not applicable (uses timing chains for EJ255/EJ257 engines). Fluid Specifications Engine Oil: SAE 5W-30, API SG/SH/SJ/SL, ACEA A3 or A5 recommended (full synthetic often preferred for performance). Coolant: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant. Brake Fluid: DOT 3 or DOT 4 Transmission Fluid Manual Wrx: SAE 75W-90 API GL-5 (Subaru Extra-S or equivalent) Transmission Fluid Manual Sti:...