Market Position:
The Subaru Impreza WRX STi RS of the 2006-2007 model years represented the pinnacle of Subaru's rally-bred performance in the compact segment, targeting enthusiasts and performance-oriented drivers seeking all-wheel-drive capability and turbocharged power.
Competitive Analysis:
Competed against iconic performance vehicles such as the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, and Ford Focus ST, differentiating itself with its symmetrical all-wheel-drive system and boxer engine configuration.
Key Features:
Iconic Subaru symmetrical all-wheel-drive, turbocharged Boxer engines, performance-tuned suspension, distinctive styling, and a robust enthusiast following.
Coverage Areas:
All aspects of service, repair, diagnostics, and maintenance for the specified Subaru Impreza models.
Page Count:
Detailed page count not specified in product information, but described as 'complete'.
Manual Type:
Workshop Service Repair Manual
Systems Covered:
Engine mechanical, engine performance, fuel system, ignition system, exhaust system, cooling system, lubrication system, transmission (manual & automatic), drivetrain, suspension, steering, brakes (ABS/non-ABS), chassis, body electrical, HVAC, SRS (airbag) system, diagnostics, troubleshooting, maintenance.
Procedures Included:
Routine maintenance, scheduled servicing, component removal and installation, detailed troubleshooting guides, diagnostic procedures, electrical circuit diagrams, torque specifications, overhaul instructions, component testing, alignment procedures, body repair, wiring schematics.
Technical Depth:
Comprehensive, covering basic maintenance to full engine and transmission rebuilds, advanced diagnostics, and specialized repair procedures. Suitable for both DIY enthusiasts and professional technicians.
File Format:
Typically PDF, optimized for digital viewing and printing.
Print Quality:
High-resolution diagrams and text for clarity.
Binding Type:
N/A (Downloadable format)
Paper Type:
N/A (Downloadable format)
Primary Engine Sti:
2.5L EJ257 turbocharged and intercooled horizontally opposed (Boxer) 4-cylinder engine.
Primary Engine Wrx:
2.0L EJ205 turbocharged and intercooled horizontally opposed (Boxer) 4-cylinder engine (standard WRX), 2.5L EJ255 turbocharged and intercooled horizontally opposed (Boxer) 4-cylinder engine (later WRX models).
Horsepower Sti:
300 hp @ 6000 rpm
Torque Sti:
290 lb-ft @ 4000 rpm
Horsepower Wrx Ej205:
227 hp @ 5600 rpm
Torque Wrx Ej205:
217 lb-ft @ 3600 rpm
Horsepower Wrx Ej255:
230 hp @ 5200 rpm
Torque Wrx Ej255:
235 lb-ft @ 3700 rpm
Fuel System Type:
Multi-point fuel injection (MPI) with electronic throttle control.
Fuel Type:
Premium Unleaded Gasoline (91 octane or higher recommended)
NHTSA Front Impact Driver:
5-star
NHTSA Front Impact Passenger:
5-star
IIHS Front Offset Bf:
Good
Active Features:
Symmetrical All-Wheel Drive, Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist (BA), Traction Control System (TCS), Vehicle Stability Control (VSC - often standard or advanced on STi).
Passive Features:
Front airbags, front side-impact airbags, front and rear head curtain airbags (on some trims), front seatbelt pretensioners, collapsible steering column, reinforced safety cage.
Infotainment System:
Basic factory AM/FM/CD stereo system with optional premium sound system. Likely lacks modern touchscreen interfaces or advanced connectivity found in later models.
Driver Assistance Features:
Limited by modern standards. Primarily ABS, EBD, and optional traction/stability control. No advanced ADAS features like adaptive cruise control or lane keeping assist.
Connectivity Options:
Basic auxiliary input for audio devices on some models. Bluetooth audio streaming or hands-free calling not standard.
Oil Change Interval:
Every 3,750 miles or 3 months (severe use) or 7,500 miles or 6 months (normal use), with specific emphasis on checking oil levels frequently for turbocharged engines.
Spark Plug Replacement:
Typically at 60,000 miles or as per manual recommendations, depending on plug type (e.g., iridium).
Timing Belt Replacement:
The EJ255 and EJ257 engines use a timing belt. Replacement is typically recommended every 60,000 to 105,000 miles or 6-7 years, depending on driving conditions. The manual will detail the exact interval and procedure.
Engine Oil Type:
Refer to manual for specific viscosity. Typically 5W-30 or 10W-30 synthetic oil (e.g., Valvoline SynPower, Motul 8100 X-cess). Capacity: approx. 4.8 US quarts (4.5 liters) for 2.0L, 5.0 US quarts (4.7 liters) for 2.5L.
Coolant Type:
Subaru Super Coolant (blue) or equivalent silicate-free, long-life coolant. Capacity: approx. 7.0-7.5 US quarts (6.6-7.1 liters).
Transmission Fluid Type Manual:
Subaru Extra-S Gear Oil (or equivalent API GL-5 rated 75W-90 synthetic gear oil). Capacity: approx. 2.0 US quarts (1.9 liters).
Differential Fluid Type:
API GL-5 rated 75W-90 synthetic gear oil. Capacity: Front approx. 0.9-1.0 US quarts (0.85-0.95 liters), Rear approx. 0.7-0.8 US quarts (0.65-0.75 liters).
Known Issues Wrx Ej205:
Potential for ringland failure, turbo seal leaks, and intercooler condensation issues, especially if not properly maintained or modified without supporting upgrades. Common on high-mileage vehicles or those subjected to aggressive driving.
Known Issues Wrx Ej255:
Similar issues to EJ205, but also reports of head gasket failures and piston ringland issues, particularly in earlier EJ255 applications. Oil consumption can be a concern.
Known Issues Sti Ej257:
The EJ257 is known for its higher performance potential but also its susceptibility to ringland failure under detonation (knock). Proper fuel, tuning, and maintenance are critical. Head gasket failures can also occur.
Known Issues General:
Subaru's Boxer engines can be prone to oil leaks from various seals (e.g., crank seals, valve cover gaskets). Clutch wear and brake wear are normal for performance vehicles.
Brand Heritage:
Subaru has a rich history in motorsport, particularly in rallying, with the Impreza WRX and WRX STi being icons of the World Rally Championship (WRC) era, known for their robust engineering and exceptional performance.
Model Evolution:
This generation (GD) of the Impreza represents a significant styling and engineering update from the previous generation, featuring a wider track, improved aerodynamics, and more powerful engine options, including the potent EJ257 for the STi.
Production Location:
Japan
Recognitions:
The Subaru Impreza WRX and WRX STi have consistently received accolades from automotive publications for their performance, handling, and all-wheel-drive capabilities, often cited as benchmarks in the sport compact segment.
Ratings:
Highly rated by enthusiasts and performance driving organizations for their dynamic capabilities and driver engagement.
Certifications:
N/A for manual product itself, but vehicle performance and safety are evaluated by independent bodies.
