Segment:
Performance Compact Sedan/Hatchback (Rally-bred homologation special)
Key Competitors:
Mitsubishi Lancer Evolution, Subaru WRX (non-STI variants), Ford Focus RS, Volkswagen Golf R
Performance Focus:
Symmetrical All-Wheel Drive, turbocharged Boxer engine, advanced DCCD system, performance suspension and brakes
Rally Heritage:
Direct lineage from Subaru's World Rally Championship (WRC) success
Powertrain:
Engine (EJ257), Transmission (6-speed manual), Drivetrain (Symmetrical AWD, DCCD)
Chassis:
Suspension (front/rear), Steering, Brakes (ABS, Brembo calipers)
Electrical:
Engine Control Module (ECM), Body Control Module (BCM), Lighting, Audio, HVAC, SRS (Airbag)
Body:
Exterior panels, Interior trim, Seats, Glass, Bumpers
Maintenance:
Scheduled maintenance, Fluid changes, Filter replacements
Diagnostics:
Troubleshooting guides, Diagnostic trouble codes (DTCs), Circuit diagrams, Component testing
Repair:
Engine overhaul, Transmission rebuild, Suspension component replacement, Brake service, Electrical component repair
Installation:
Component replacement procedures, Special tool usage
Depth:
Comprehensive (covers basic to advanced diagnostics and repair, including full engine and transmission rebuilds)
File Type:
PDF (Portable Document Format)
Searchability:
Likely text-searchable (OCR'd for easy content navigation)
Quality:
High-resolution scans, clear diagrams and illustrations
Binding:
Not applicable for digital format; refers to ease of digital navigation.
Paper Quality:
Not applicable for digital format; refers to image clarity.
Coverage Statement:
100% Complete, no missing/corrupt pages/sections guaranteed.
Engine Type:
2.5L Flat-Four (Boxer), Turbocharged, Intercooled
Horsepower:
300 HP @ 6000 RPM (SAE Net, typical for USDM)
Torque:
300 lb-ft @ 4000 RPM (SAE Net, typical for USDM)
Fuel Delivery:
Sequential Multi-Port Fuel Injection (MPI)
Fuel Type:
Premium Unleaded Gasoline (91 Octane or higher recommended)
ECU Type:
Denso ECU (specific part numbers vary by region)
Ignition System:
Distributorless Ignition System (DIS) with Coil-on-Plug (COP)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent phosphate-free ethylene glycol-based coolant
Coolant Capacity:
Approx. 7.1 Liters (7.5 US Quarts)
Type:
6-Speed Manual Transmission (TY856WB1AA for USDM)
Type:
None available for STI models.
Dccd:
Driver Controlled Center Differential (mechanical and electronic control for torque distribution)
Differential Type:
Front: Helical Limited Slip Differential (LSD); Rear: Viscous Center Coupling, Mechanical LSD
Gear Oil Type:
Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent API GL-5 synthetic gear lubricant
Gear Oil Capacity:
Approx. 2.5 Liters (2.6 US Quarts)
NHTSA Front Impact:
5 Stars (for compatible models/years)
NHTSA Side Impact:
5 Stars (for compatible models/years)
IIHS Top Safety Pick:
Likely 'Good' ratings in relevant categories for compatible models/years
Braking System:
4-wheel disc brakes with ABS; Front: 4-piston Brembo; Rear: 2-piston Brembo
Traction Control:
Standard Symmetrical AWD with DCCD
Airbags:
Driver and front passenger airbags, front side-impact airbags, side curtain airbags (optional/market dependent)
Seatbelts:
3-point front and rear seatbelts with pre-tensioners and force limiters
Head Unit:
Aftermarket head unit installation is common due to OEM unit limitations.
Audio System:
Premium audio system (e.g., 6-speaker, subwoofer in some trims).
ABS:
Standard Anti-lock Braking System
AWD:
Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)
Aux Input:
Standard Aux-in jack for audio devices (on factory head units)
Oil Change Interval:
Every 3,750 miles or 6 months (severe duty) or 7,500 miles or 12 months (normal duty)
Major Service Items:
Timing belt (if applicable, though EJ257 typically uses a timing chain or is belt-driven, check specific engine assembly), spark plugs, fluids (coolant, brake, transmission, differential)
Engine Oil Type:
5W-30 or 10W-30 Synthetic Engine Oil (API SN or higher, ILSAC GF-5 or higher)
Engine Oil Capacity:
Approx. 4.8 Liters (5.1 US Quarts) with filter change
Brake Fluid Type:
DOT 4 (or DOT 3 for ABS modulator compatibility if specified)
Power Steering Fluid Type:
Subaru ATF-HP or Dexron III equivalent
Engine Common Problems:
Head gasket failure (less common on EJ257 than earlier EJ25s but still possible), piston ring land failure (ringland failure), turbocharger issues (oil starvation), thrown rod (severe engine failure).
Transmission Common Problems:
Clutch wear, potential for synchro issues in high-mileage vehicles.
Suspension Common Problems:
Wear of control arm bushings, sway bar links, and struts due to performance driving.
Electrical Common Problems:
Window motor failures, minor sensor issues.
Motorsport Legacy:
Subaru's strong WRC heritage and continuous development of performance vehicles.
Generation:
Second Generation (GD/GG) - facelifted version
Sti Development:
Evolution of the Impreza WRX STI, building upon rally-winning platforms.
Production Period:
2000-2007 (GD/GG generation)
Manufacturing Location:
Japan (Subaru's Gunma Plant)
Performance Accolades:
Consistently praised by automotive media for its handling, AWD system, and rally-inspired performance.
Track Day Favorite:
Popular choice for track days and autocross events.
Enthusiast Ratings:
Highly rated by automotive enthusiasts for its engaging driving experience and tuning potential.
