Segment:
Performance Compact Sedan/Hatchback
Target Audience:
Enthusiasts, tuners, DIY mechanics, professional technicians
Competitors:
Mitsubishi Lancer Evolution, Subaru WRX (non-STI variants)
Performance Focus:
All-wheel drive, turbocharged boxer engine, rally heritage
Manual Value Proposition:
Empowers owners and technicians with in-depth knowledge for maintenance, repair, and customization
Primary Coverage:
Mechanical, Electrical, Body, Diagnostics
Secondary Coverage:
Maintenance, Repair, Overhaul, Troubleshooting
Estimated Pages:
Approximately 3000+
Type:
Workshop Service Repair Manual
Engine Mechanical:
Engine assembly, cylinder head, pistons, crankshaft, lubrication, cooling
Engine Management:
ECU, fuel injection, ignition system, emissions control, turbocharger system
Transmission Drivetrain:
Manual transmission (TY856), differential, driveshafts, AWD system (DCCD)
Suspension Steering:
Front and rear suspension, steering gear, power steering
Brakes:
Brake system, ABS, parking brake, brake fluid specifications
Electrical System:
Battery, charging system, starting system, lighting, wiring diagrams, fuses, relays
Body Exterior:
Body panels, doors, hood, trunk, bumpers, exterior trim, glass
Body Interior:
Interior trim, seats, dashboard, airbags, HVAC system
Diagnostics Troubleshooting:
On-board diagnostics (OBD-II), DTC codes, symptom-based troubleshooting guides
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug service
Repair Overhaul:
Engine rebuild, transmission rebuild, brake caliper replacement, suspension component replacement
Diagnostics:
Troubleshooting electrical faults, diagnosing engine performance issues
Installation Adjustment:
Component installation (e.g., clutch, turbocharger), calibration procedures
Depth:
Comprehensive, covering routine maintenance to major component overhauls and detailed diagnostics
Detail Level:
Detailed exploded views, torque specifications, diagnostic flowcharts, wiring diagrams
Engine Type:
Horizontally-opposed turbocharged 4-cylinder (Boxer)
Displacement:
2.5 Liters (2457 cc)
Bore X Stroke:
99.5 mm x 80.0 mm
Valve Train:
DOHC, 16 valves, belt-driven
Horsepower Hp:
300 hp @ 6000 rpm
Torque Lb-Ft:
300 lb-ft @ 4000 rpm
Fuel Delivery:
Multi-point Fuel Injection (MPI)
Fuel Type:
Premium Unleaded Gasoline (91+ Octane Recommended)
Turbocharger:
IHI VF39 (Domestically Marketed Models)
Intercooler:
Top-mount air-to-air intercooler
Type:
6-Speed Manual Transmission
Type:
N/A (STI exclusively manual)
Dccd:
Driver Controlled Center Differential (DCCD) with automatic and manual modes
AWD System:
Symmetrical All-Wheel Drive with viscous coupling center differential and rear limited-slip differential (LSD)
Transmission Fluid Type:
GL-5 Gear Oil (e.g., Subaru Extra-S Gear Oil)
Transmission Fluid Capacity:
Approx. 2.5 Liters
NHTSA Front Crash Rating:
4 Stars (Driver), 5 Stars (Passenger)
IIHS Crash Test Ratings:
Good (Frontal Offset), Acceptable (Side Impact)
ABS:
Standard Anti-lock Braking System
Ebs:
Electronic Brake-force Distribution (EBD)
Traction Control:
Traction Control System (TCS)
Airbags:
Driver and front passenger airbags, front side airbags
Seatbelts:
3-point front and rear seatbelts with pre-tensioners
Rollover Protection:
Reinforced body structure
Oil Change Interval:
Every 3,750 miles or 3 months (severe duty/enthusiast driving) or 7,500 miles or 6 months (normal duty)
Air Filter Replacement:
Every 15,000 miles or 12 months
Spark Plug Replacement:
Every 60,000 miles (iridium type)
Timing Belt Replacement:
Every 105,000 miles or 7 years (refer to manual for exact interval)
Engine Oil Type:
0W-30 Synthetic (API SN or higher recommended, SAE 5W-30 acceptable)
Engine Oil Capacity:
Approx. 4.8 US quarts (4.6 L) with filter change
Coolant Type:
Subaru Super Coolant (Blue) or equivalent (50/50 mix with distilled water)
Brake Fluid Type:
DOT 3 or DOT 4
Head Gaskets:
While less common on EJ257 than earlier EJ25s, coolant leaks can still occur. Manual details inspection and replacement.
Ringland Failure:
Potential for piston ringland failure under high boost/improper tuning. Manual provides diagnostic steps.
Clutch Wear:
Can be subject to accelerated wear due to performance driving. Manual covers clutch inspection and replacement.
Turbocharger Wear:
VF39 turbo can develop shaft play over time. Manual offers troubleshooting and rebuild guidance.
Motorsport Roots:
Subaru's extensive rally history, particularly in the World Rally Championship (WRC)
Generation:
Second Generation (GD/GG Impreza, 2000-2007)
Year Specific Changes:
Updated styling, suspension tuning, and power increase for 2006 model year
Manufacturing Plant:
Ōta, Gunma, Japan
Production Years:
2000-2007 (GD/GG platform)
Car And Driver:
Car and Driver 10Best list (multiple years for WRX/STI variants)
Motor Trend:
MotorTrend Car of the Year contender (previous generations)
Rally Heritage Certification:
Homologated for WRC (World Rally Championship) competition, influencing its design and capabilities
