🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2006 Generation Generation: Third Generation (GE/GH/GR/GV) Codes Chassis Code: GDB-F Engine Code Wrx: EJ255 (H4DOTC) Engine Code Sti: EJ257 (H4SO/STi) 👋 Introduction Market Position Segment: Performance Compact Sedan/Wagon Target Audience: Enthusiast drivers, DIY mechanics, professional technicians working on 2006 Subaru Impreza WRX and STI models. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI, Honda Civic Si. Key Features Distinguishing Features Vehicle: Symmetrical All-Wheel Drive, turbocharged Boxer engines, rally-bred performance heritage, distinct STI aerodynamics and suspension tuning. Distinguishing Features Manual: Factory authorized repair information, clear step-by-step instructions, comprehensive diagrams, covers both WRX and STI variants for the specified year. 📋 Manual Details Coverage Areas Primary Coverage: Complete factory service repair Secondary Coverage: Maintenance, troubleshooting, diagnostics, repair, overhaul Page Count Estimated Page Count: Thousands (typical factory service manuals are extensive) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Systems: H4DOTC (WRX) & H4SO/STi (STI) engines, including fuel, ignition, lubrication, cooling, timing, emissions, and turbocharging systems. Powertrain Systems: Manual Transmission (5-speed WRX, 6-speed STI), clutch system, drive shafts, differentials (front, center viscous coupling, rear Limited Slip). Chassis Systems: Suspension (front McPherson strut, rear multi-link), steering, brakes (ventilated discs front/rear, ABS, EBD), wheels and tires. Electrical Systems: Wiring diagrams, fuse box layouts, lighting, instrumentation, starting and charging systems, engine control module (ECM) wiring, body control module (BCM) wiring, audio systems. Body Systems: Exterior body panels, interior trim, doors, windows, locks, glass, body repair, structural integrity. Procedures Included Maintenance Procedures: Scheduled maintenance intervals, oil and filter changes, fluid checks and replacements (coolant, brake fluid, transmission fluid, differential fluid), spark plug replacement, air filter replacement. Repair Procedures: Engine disassembly and reassembly, transmission overhaul, clutch replacement, brake component replacement, suspension component replacement, steering rack repair, exhaust system repair, turbocharger service. Diagnostics Troubleshooting: Troubleshooting guides for common drivability issues, diagnostic trouble codes (DTCs) and their meanings, symptom-based diagnostics, electrical system diagnosis using wiring diagrams. Technical Depth Depth Level: Comprehensive, covering all aspects from basic maintenance to complete engine and transmission rebuilds. Diagnostic Tools: Information on using Subaru Select Monitor (SSM) or equivalent OBD-II scanners for diagnostics. Illustrations: Detailed exploded diagrams, line drawings, and technical illustrations for component identification and assembly procedures. 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Compatibility: Compatible with all versions of Windows and Mac operating systems. Requirements: Adobe Acrobat Reader (or compatible PDF viewer) and WinZip (or compatible file archiver) required for access and use. Print Quality Printability: All pages are printable, allowing for hard copy reference. Binding Type Binding: Digital (no physical binding) Paper Type Paper Type: N/A (Digital Format) Delivery Delivery Method: Instant Download ⚙️ Engine Specifications Primary Engine Engine Type Wrx: 2.5L DOHC Turbocharged Boxer 4-cylinder (EJ255) Engine Type Sti: 2.5L DOHC Turbocharged Boxer 4-cylinder (EJ257) Performance Horsepower Wrx: 224 hp @ 5200 rpm (approx.) Torque Wrx: 226 lb-ft @ 3600 rpm (approx.) Horsepower Sti: 300 hp @ 6000 rpm (approx.) Torque Sti: 300 lb-ft @ 4000 rpm (approx.) Fuel System Fuel Delivery: Multi-point fuel injection (MPI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management ECU: Engine Control Unit (ECU) with specific tuning for WRX and STI models. Turbocharging Turbocharger Type Sti: IHI VF39 (or similar) Intercooler Type: Top-mounted air-to-air intercooler 🔧 Transmission Standard Transmission Type Wrx: 5-speed manual Transmission Type Sti: 6-speed manual Optional Optional Transmission: Not available for WRX STI models in 2006. Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with driver-controlled center differential (DCCD) on STI. Clutch Type: Hydraulically actuated, single dry plate clutch. 📐 Dimensions Exterior Wheelbase: Approx. 103.0 inches (2615 mm) Length: Approx. 173.8 inches (4415 mm) Width: Approx. 70.1 inches (1780 mm) Height: Approx. 57.7 inches (1465 mm) Weights Curb Weight Wrx: Approx. 3131 lbs (1420 kg) Curb Weight Sti: Approx. 3263 lbs (1480 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star Driver & Passenger (for sedan models of this generation) IIHS Side Impact: Good (for sedan models of this generation) Active Features Braking System: Four-wheel disc brakes with ABS, Electronic Brake-force Distribution (EBD). Traction Control: Standard on WRX, enhanced AWD system with DCCD on STI. Passive Features Airbags: Front airbags, side-curtain airbags (optional/standard depending on trim). Seatbelts: 3-point height-adjustable front seatbelts with pretensioners, three 3-point rear seatbelts. 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD player with optional premium audio system. Instrumentation: Includes tachometer, speedometer, fuel gauge, coolant temperature gauge, and warning lights; STI features a center console gauge cluster (boost, oil pressure/temp). Driver Assistance Cruise Control: Standard cruise control. Connectivity Connectivity Options: Limited by 2006 standards, typically auxiliary input for audio. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 3 months (severe duty), 7,500 miles or 6 months (normal duty), consult manual for specific conditions. Timing Belt Replacement:...