Segment:
Performance Compact Sedan/Hatchback
Positioning:
Homologation special for WRC, rallying pedigree, enthusiast-focused performance model.
Key Competitors:
Mitsubishi Lancer Evolution, Ford Focus RS, Honda Civic Type R (where applicable).
Performance Focus:
Turbocharged boxer engine, Symmetrical All-Wheel Drive, advanced DCCD system, performance braking.
Rally Heritage:
Direct lineage to Subaru's World Rally Championship success, built for demanding conditions.
Engine Mechanical:
Detailed diagnosis, overhaul, and repair for the EJ207 engine (including turbocharger, intercooler, fuel injection, ignition, cooling systems).
Transmission Drivetrain:
Service and repair procedures for the 6-speed manual transmission (TY856), DCCD (Driver's Control Center Differential), center differential, rear differential, driveshafts, and axles.
Brakes:
Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ABS system diagnosis and repair, brake fluid specifications and bleeding procedures.
Suspension Steering:
Front MacPherson struts, rear multi-link suspension, power steering system diagnosis and repair, alignment specifications.
Electrical Electronics:
Full wiring diagrams, component locations, fuse box layouts, ECU pinouts, diagnostic trouble codes (DTCs), audio system, lighting, instrumentation, immobilizer system.
Body Chassis:
Body panel removal and installation, interior trim, glass, sunroof, body sealing, structural repair guidelines.
Maintenance:
Scheduled maintenance intervals, oil change procedures, filter replacement, spark plug replacement, coolant flushing, brake pad replacement.
Troubleshooting:
Extensive diagnostic procedures for all major systems, symptom-based troubleshooting guides, DTC interpretation and resolution.
Repair Overhaul:
Step-by-step instructions for engine rebuilds, transmission overhauls, suspension component replacement, brake system repairs, electrical component repair.
Diagnostics:
Procedures for using Subaru Select Monitor (SSM) or equivalent OBD-II scanners, data stream analysis, actuator testing.
Depth:
Comprehensive; covers everything from basic fluid checks to complete engine and transmission rebuilds, including detailed torque specifications and measurement tolerances.
Configuration:
2.0L Flat-4 (Boxer), DOHC, 16-valve
Induction:
Twin-scroll Turbocharger (IHI VF35 or similar), Top-mount Intercooler
Horsepower Ps:
265 PS (approx. 261 bhp)
Torque Nm:
343 Nm (approx. 253 lb-ft)
Fuel Delivery:
Sequential Electronic Fuel Injection (SEFI)
Fuel Type:
Unleaded Gasoline (Premium Unleaded 98 RON recommended)
Bore X Stroke:
92.0 mm x 75.0 mm
Type:
6-speed Manual Transmission
Transmission:
None (STI was exclusively manual)
Dccd:
Driver's Control Center Differential (manual locking/auto modes)
AWD System:
Subaru Symmetrical All-Wheel Drive
Gear Oil Type:
API GL-5, SAE 75W-90 (Hypoid Gear Oil)
Length:
4,405 mm (173.4 in)
Width:
1,770 mm (69.7 in)
Height:
1,410 mm (55.5 in)
Wheelbase:
2,510 mm (98.8 in)
Curb Weight:
1,440 kg (3,175 lbs) approx.
Gross Vehicle Weight Rating:
1,840 kg (4,057 lbs) approx.
Trunk Volume:
370 L (13.1 cu ft) approx. (Sedan)
NHTSA Front Impact:
Not explicitly rated for 2004 model year in the same format as later years, but known for robust chassis design.
ABS:
Standard (with EBD - Electronic Brakeforce Distribution)
Traction Control:
Standard (SI-DRIVE not applicable)
Airbags:
Driver and Passenger Frontal Airbags, Side Airbags (optional/market dependent)
Body Structure:
Ring-shaped reinforcement frame, energy-absorbing crumple zones.
Head Unit:
Factory single-DIN CD player with AM/FM radio; aftermarket upgrades common.
Speakers:
Factory 6-speaker system (door speakers, tweeters, rear coaxial).
Limited Slip Differential:
Front Helical LSD, Rear Viscous LSD (in addition to DCCD).
Aux Input:
Not standard; aftermarket solutions required.
Oil Change:
Every 7,500 miles or 6 months, whichever comes first (or more frequently under hard driving conditions).
Air Filter:
Every 15,000 miles or 12 months.
Spark Plugs:
Every 30,000 miles (iridium type).
Timing Belt:
Not applicable; EJ207 uses a timing chain system (though some components may require periodic inspection/replacement).
Engine Oil Capacity:
4.5 Liters (4.8 US Quarts) with filter change (SAE 5W-30, API SG or SH, ILSAC GF-2 or higher recommended).
Coolant Type:
Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant.
Brake Fluid:
DOT 3 or DOT 4.
Engine Wear:
Piston ring land failure on heavily modified or poorly maintained engines; head gasket issues are less common than on other Subaru models but can occur.
Turbocharger:
Potential for oil starvation if maintenance is neglected, leading to turbo failure.
Dccd:
Potential for electronic or mechanical issues with the DCCD unit over time, often related to fluid contamination or actuator wear.
Suspension:
Worn bushings and struts are common due to the performance-oriented suspension and spirited driving.
Brand Focus:
Specializing in All-Wheel Drive vehicles and rally racing.
Generation:
GD chassis (2000-2007), this is the 'Bugeye' to 'Blobeye' transition year.
Sti Development:
Evolved from rally homologation needs, focused on driver engagement and performance.
Production Period:
2004 model year
Manufacturing Location:
Japan
