🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Model Variant: STI (Turbo) & Impreza (Naturally Aspirated/Non-Turbo) Generation Generation Code: GDB/GGB (Third Generation Impreza Chassis) Codes Model Years: 2006, 2007 👋 Introduction Market Position Vehicle Segment: Compact sports sedan/hatchback (performance-oriented). Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Subaru WRX (non-STI variants), Volkswagen Golf GTI, Honda Civic Si. Key Features Performance Focus: Renowned for its Symmetrical All-Wheel Drive system, turbocharged boxer engines, and rally-bred performance heritage. Manual Value Proposition: Provides dealership-level repair and maintenance expertise, enabling owners to perform complex tasks, saving on labor costs and ensuring proper vehicle care. 📋 Manual Details Coverage Areas Documentation Scope: Comprehensive A-Z repair and maintenance for all models and all repairs. Page Count Estimated Pages: 1500+ (typical for such comprehensive workshop manuals) Manual Type Type: Factory-Authorized Workshop Manual / Service and Repair Manual Language Language: English Format Format: Digital (PDF) or Printed (as per product offering, assumed high-quality reproduction if printed) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical (EJ255, EJ257), fuel system, ignition system, exhaust system, turbocharger system, intercooler system. Transmission: Manual transmission (TY856), clutch system, drivetrain (AWD system, differentials, driveshafts). Chassis: Suspension (front and rear), steering system, braking system (ABS, EBD), wheel alignment, body and frame. Electrical: Engine control module (ECM), body control module (BCM), lighting, instrumentation, audio system, power accessories, wiring diagrams, diagnostic trouble codes (DTCs). Procedures Included Maintenance: Routine maintenance, fluid changes, filter replacements, scheduled servicing. Diagnosis And Troubleshooting: System diagnostics, fault finding, symptom-based troubleshooting, DTC interpretation. Repair And Rebuild: Component disassembly, inspection, repair, and reassembly for all major systems. Includes engine rebuild procedures, transmission overhaul, brake caliper replacement, etc. Special Tools And Equipment: Identification and usage of specific Subaru-required tools for repairs and diagnostics. Technical Depth Depth: In-depth technical information, including specifications, tolerances, torque values, and diagnostic procedures, equivalent to dealership technician level. 📊 Manual Specifications File Format Digital Format: PDF (likely searchable and printable) Print Quality Print Quality: High-resolution scans ensuring clarity of diagrams, text, and images. Binding Type Binding: N/A (if digital) or Professional binding (if printed) Paper Type Paper Type: N/A (if digital) or Durable, high-quality paper suitable for workshop environments (if printed) ⚙️ Engine Specifications Primary Engine Sti Engine Code Sti: EJ257 Configuration Sti: 2.5L Flat-4 (Boxer), turbocharged, intercooled Horsepower Sti Approx: 300 hp @ 6000 rpm (SAE Net) Torque Sti Approx: 310 lb-ft @ 4000 rpm (SAE Net) Primary Engine Non Sti Engine Code Non Sti: EJ255 (common, may vary by specific non-STI model) Configuration Non Sti: 2.5L Flat-4 (Boxer), naturally aspirated or turbocharged (depending on specific Impreza model within 2006-2007 range, though manual specifies 'Turbo NON Turbo') Horsepower Non Sti Approx: 170-237 hp (depending on naturally aspirated or turbo WRX variants) Torque Non Sti Approx: 170-250 lb-ft (depending on naturally aspirated or turbo WRX variants) Performance Redline Sti: 7000 rpm Fuel System Injection Type: Multi-point fuel injection (MPI) or Sequential Electronic Fuel Injection (SEFI), including high-performance injectors for STI. Fuel Requirement: Premium Unleaded (91 octane or higher recommended for STI) Engine Management ECU Type: Subaru Engine Control Module (ECM) with advanced tuning capabilities for STI. 🔧 Transmission Standard Transmission Type Sti: 6-speed manual transmission (TY856) Transmission Type Non Sti: 5-speed manual transmission (likely for non-STI WRX) or 4/5-speed automatic (for base Impreza models, but manual focus is likely performance variants). Optional Optional Transmission: 5-speed automatic transmission (less common for performance models, but may be covered for standard Impreza variants) Features AWD System: Subaru Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) for STI, viscous coupling center differential for WRX. Clutch Type: Hydraulically actuated, multi-plate (STI) or single-plate (WRX). 📐 Dimensions Exterior Sti Sedan Length: 4415 mm (173.8 in) Width: 1795 mm (70.7 in) Height: 1440 mm (56.7 in) Wheelbase: 2620 mm (103.2 in) Weights Sti Curb Weight Sti: approx. 1500 kg (3307 lbs) 🛡️ Safety Features Ratings NHTSA Rating 2006: Likely 5-star frontal driver/passenger, 4-star frontal offset, 5-star side impact (typical for the generation, consult specific model year reports). Active Features Traction Control: Subaru Vehicle Dynamics Control (VDC) system. ABS: Anti-lock Braking System (ABS) with Electronic Brakeforce Distribution (EBD). AWD: Symmetrical All-Wheel Drive (essential safety and performance feature). Passive Features Airbags: Frontal airbags, side curtain airbags, front side airbags. Seatbelts: Three-point height-adjustable seatbelts with pretensioners. Body Structure: Advanced crumple zones and energy-absorbing structure. 💡 Technology Features Infotainment Audio System: Factory premium audio system with CD player, AM/FM radio, and potentially auxiliary input. STI models may feature enhanced speaker systems. Driver Assistance Cruise Control: Standard electronic cruise control. Instrument Cluster: Performance-oriented instrument cluster with tachometer, speedometer, boost gauge (STI), and various warning lights. Manual details gauge cluster removal and diagnostics. Connectivity Wiring Diagrams: Comprehensive wiring diagrams for all electrical systems, essential for diagnosing and repairing electronic faults or adding aftermarket components. 🔧 Maintenance Service Intervals Oil Engine Oil Change Sti: Every 3,750...