🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Generation: Third Generation (GR/GH/GE/GV/GVB) Model Years Covered: 2006-2007 Codes Chassis Codes: GVB (Hatchback), GVF (Sedan) Engine Codes Primary: EJ257 👋 Introduction Market Position Segment: Performance Compact / Rally Homologation Special Target Audience: Enthusiasts, performance drivers, rally fans, tuners, and owners seeking in-depth maintenance and repair knowledge. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Honda Civic Type R, Ford Focus RS Key Features Performance Focus: Engineered for high-performance driving with advanced AWD, powerful turbocharged engine, and sophisticated suspension. Rally Heritage: Direct descendant of Subaru's WRC (World Rally Championship) lineage, offering a potent combination of power, handling, and durability. Driver Engagement: Emphasis on driver feedback and control, with a communicative steering system and a robust manual transmission. 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Drivetrain: Yes Suspension: Yes Brakes: Yes Steering: Yes Electrical System: Yes HVAC: Yes Body And Trim: Yes Interior: Yes Diagnostics And Troubleshooting: Yes Wiring Diagrams: Yes Torque Specifications: Yes Tightening Sequences: Yes Maintenance Schedule: Yes Fluid Capacities: Yes Component Locations: Yes Page Count Estimated Pages: > 2000 (typical for comprehensive manuals of this era) Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed disassembly, inspection, and reassembly of EJ257 boxer engine, including cylinder heads, pistons, crankshaft, connecting rods, timing belt system, and lubrication system. Engine Management: ECU (Engine Control Unit) operation, sensor inputs (MAF, MAP, O2, Knock, Cam/Crank position), fuel injection strategy, ignition timing control, and emissions control systems. Turbocharger And Intercooler: Removal, inspection, and installation of the TD04 turbocharger, blow-off valve (BOV), wastegate actuator, and top-mount intercooler system, including boost pressure control. Transmission Manual: Detailed procedures for the 6-speed manual transmission (TY856), including clutch replacement, gearbox disassembly, inspection of gears, synchronizers, and shift mechanisms. Drivetrain AWD: Subaru's Symmetrical All-Wheel Drive system, including front and rear differentials, center differential operation (DCCD - Driver's Control Center Differential for STI), driveshafts, and wheel hubs. Suspension And Steering: Front and rear suspension components (struts, springs, control arms, sway bars), steering rack, power steering system, wheel alignment specifications, and strut tower brace. Braking System: Brake system components including Brembo calipers (front and rear), brake pads, rotors, brake lines, master cylinder, ABS (Anti-lock Braking System) module, and parking brake. Electrical And Electronics: Full wiring diagrams, fuse box layouts, lighting systems, power windows, central locking, instrument cluster, audio system, and ECU pinouts. HVAC System: Air conditioning system operation, refrigerant, compressor, condenser, evaporator, heater core, and climate control module. Body And Exterior: Body panel removal and installation, door mechanisms, hood, trunk/tailgate, bumpers, fenders, spoilers, and exterior trim. Interior Trim: Dashboard removal, seat removal and installation, door panel trim, headliner, and interior lighting. Procedures Included Routine Maintenance: Oil changes, filter replacements (oil, air, cabin), spark plug replacement, brake fluid flush, coolant replacement, and drive belt inspection/replacement. Component Replacement: Detailed step-by-step instructions for replacing virtually all major and minor components within the vehicle. Troubleshooting Guides: Systematic diagnostic procedures for identifying and resolving common and uncommon vehicle issues, often including symptom-based troubleshooting trees. Rebuild Procedures: Comprehensive instructions for rebuilding major sub-assemblies like the engine, transmission, and differentials. Diagnostic Tools Usage: Information on using Subaru's Select Monitor (SSM) or equivalent diagnostic tools for reading trouble codes and accessing live data. Specifications Data: Precise torque values for all fasteners, critical component clearances, fluid specifications, and wear limits. Technical Depth Depth: Comprehensive: Covers everything from basic fluid checks to complete engine and transmission overhauls. Suitable for professional mechanics and dedicated enthusiasts. 📊 Manual Specifications File Format File Type: Searchable PDF Printability: Printable pages Print Quality Image Resolution: High-resolution images, diagrams, and schematics for clarity Binding Type Binding: N/A (Digital PDF) Paper Type Paper Quality: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L DOHC 16-valve turbocharged flat-four (Boxer) Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.2:1 Performance Horsepower: 300 hp @ 6200 rpm Torque: 330 lb-ft (447 Nm) @ 4000 rpm Fuel System Fuel Delivery: Sequential Multi-Port Fuel Injection (S-MPI) with Electronic Throttle Control (ETC) Fuel Type Required: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management Engine Control Unit: ECU: Denso / Hitachi (specifics may vary by market) Turbocharger Turbocharger Model: IHI VF39 (twin-scroll) Intercooler Type: Top-mount air-to-air intercooler 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission (TY856) Optional Optional Transmission: N/A for WRX STI models of this generation Features All Wheel Drive: Symmetrical All-Wheel Drive with Driver's Control Center Differential (DCCD) Dccd Modes: Manual (16-step) and Auto modes for center differential locking Fluid Specifications Manual Transmission Fluid: Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent API GL-5, SAE 75W-90 synthetic gear oil 📐 Dimensions Exterior Length: 4415 mm (Hatchback) / 4580 mm (Sedan) Width: 1795 mm Height: 1475 mm (Hatchback) / 1465 mm (Sedan) Wheelbase:...