Segment:
Performance Compact Sedan/Hatchback
Usp:
Iconic rally heritage, symmetrical all-wheel drive, turbocharged boxer engine, performance tuning potential.
Key Competitors:
Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Mazdaspeed3.
Performance Focus:
Emphasizes its performance capabilities and motorsport-derived engineering.
Diy Support:
Aimed at enthusiasts and DIY mechanics seeking to maintain or repair their vehicles efficiently by correctly identifying parts.
Powertrain Components:
Engine assembly, cylinder head, pistons, connecting rods, crankshaft, camshafts, valves, turbocharger, intercooler, fuel system (injectors, pump, lines), exhaust system, cooling system.
Drivetrain Components:
Transmission (manual and automatic variants if applicable), clutch assembly, driveshafts, differentials (front, center, rear), wheel hubs, axles.
Suspension Steering Components:
Front and rear suspension struts, springs, control arms, bushings, anti-roll bars, steering rack, power steering pump, tie rods.
Braking Components:
Brake calipers (front and rear Brembo units for STi), brake discs/rotors, brake pads, brake lines, master cylinder, ABS components.
Electrical Components:
Alternator, starter motor, battery, ECU, wiring harnesses, sensors (engine, ABS, etc.), ignition coils, spark plugs.
Body Exterior Components:
Body panels (fenders, hood, doors, bumpers, spoilers), lighting (headlights, taillights), glass, mirrors, trim pieces, roof rails (if applicable).
Interior Components:
Seats, dashboard components, steering wheel, HVAC controls, door panels, carpets, audio system components.
Part Identification:
Identification of specific components and their corresponding OEM part numbers.
Part Verification:
Cross-referencing part numbers for correct application to specific model years and trims.
Labor Information Reference:
Inclusion of labor time estimates or information, often useful for DIYers planning repairs or for professional shops.
Depth:
Detailed component-level breakdown for parts sourcing and identification. Not a diagnostic or repair procedure manual, but essential for obtaining the correct parts for repairs.
Engine Type:
2.5L Turbocharged Boxer-4
Bore X Stroke:
99.5 mm x 79 mm
Horsepower:
305 hp @ 6000 rpm (approximate, may vary slightly by year/market)
Torque:
290 lb-ft @ 4000 rpm (approximate, may vary slightly by year/market)
Fuel Delivery:
Sequential Electronic Fuel Injection (EFI)
Fuel Type:
Premium Unleaded Gasoline (91 octane or higher recommended)
Turbocharger Type:
Twin-scroll Turbocharger (IHI VF48 or similar)
Transmission Type:
6-Speed Manual Transmission
Transmission Type:
No automatic transmission offered for WRX STi during these model years.
Drivetrain:
Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) and Active Torque Distribution.
Manual Transmission Fluid:
GL-5 75W-90 Synthetic gear oil. Specific Subaru or equivalent fluid recommended (e.g., Subaru Extra-S). Verify exact specification for transmission case.
NHTSA Front Impact:
5-Star (for applicable models/years)
IIHS Side Impact:
Good (for applicable models/years)
ABS:
Standard, performance-tuned Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD).
Traction Control:
Standard Subaru Vehicle Dynamics Control (VDC), including traction and stability control.
Airbags:
Front dual-stage airbags, front side-impact airbags, side curtain airbags (front and rear).
Seatbelts:
3-point height-adjustable front seatbelts with pre-tensioners and force limiters, rear 3-point seatbelts.
Structure:
Reinforced body structure with front and rear crumple zones.
Head Unit:
Standard factory audio system with CD player, AM/FM radio, auxiliary input. Optional navigation systems available on higher trims/later years.
Speaker System:
Typically 6-speaker or 10-speaker premium audio system (e.g., with subwoofer) depending on trim level.
Cruise Control:
Standard cruise control.
Keyless Entry:
Standard keyless entry system.
Bluetooth:
Limited Bluetooth connectivity often integrated into head unit or available as an option, depending on trim and year.
Oil Change Interval:
Every 3,750 miles or 6 months (severe driving conditions) / 7,500 miles or 12 months (normal driving conditions). Consult owner's manual for specifics.
Timing Belt Replacement:
Not applicable. The EJ257 engine uses a timing chain, which is generally considered maintenance-free over the vehicle's lifespan, though tensioners and guides may require inspection.
Spark Plug Replacement:
Typically around 60,000 miles, but check specific recommendations.
Engine Oil Capacity:
5.1 US quarts (4.8 liters) with filter change.
Engine Oil Type:
0W-30 or 5W-30 Synthetic engine oil meeting API SN or ILSAC GF-5 specifications. Subaru recommends specific grades.
Coolant Type:
Subaru Super Coolant (Blue) or equivalent. Check owner's manual for correct mixture and capacity.
Head Gasket Leaks:
While less prevalent on the EJ257 compared to earlier EJ25 engines, it's a known area for inspection. Early detection is crucial.
Ringland Failure:
Can occur due to excessive detonation or aggressive tuning. Proper fueling and maintenance are critical.
Clutch Wear:
Performance-oriented clutch can wear faster with aggressive driving.
Oil Filter:
Subaru 15208AA100 (or equivalent aftermarket such as Wix 57055, K&N HP-1010)
Air Filter:
Subaru 16546AA10A (or equivalent aftermarket)
Cabin Air Filter:
Subaru 72880FG013 (or equivalent aftermarket)
Rally Roots:
Subaru's long-standing success in the World Rally Championship (WRC) directly influenced the development and performance of the Impreza WRX and WRX STi models.
Generation Transition:
The 2008-2011 models represented the third generation (GR/GV), marking a significant design departure with the introduction of the hatchback body style (GR) alongside the sedan (GV), moving away from the 'bug-eye' and 'blob-eye' designs of previous generations.
Manufacturing Location:
Ota City, Gunma Prefecture, Japan
Car And Driver Best List:
Often featured on Car and Driver's '10Best' lists for its performance and value.
Motor Trend Car Of The Year:
While not winning overall, the Impreza line (including WRX variants) has been a contender or received accolades from publications like MotorTrend.
Overall Performance Reviews:
Consistently praised for its handling, acceleration, and all-weather capability.
