🏷️ Basic Information

Make:

Subaru

Model:

Impreza / WRX / WRX STI

Model Years Covered:

2006, 2007

Chassis Code:

GD (Hatchback/Wagon), GG (Sedan)

Platform:

Subaru Global Platform (precursor to current generation)

👋 Introduction

Segment:

Compact Performance Sedan/Hatchback

Target Audience:

Enthusiast drivers, rally enthusiasts, performance car owners, DIY mechanics

Key Competitors:

Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Mazdaspeed3

Drivetrain Layout:

Symmetrical All-Wheel Drive (standard on all trims)

Performance Focus:

WRX and STI trims offer turbocharged performance and enhanced handling

Rally Heritage:

Direct lineage from Subaru's WRC success

📋 Manual Details

Regions Covered:

Global (primarily North American and Japanese market specifications)

Estimated Page Count:

1500+

Type:

Factory Service Manual / Repair Manual

Origin:

Official Factory Service Manual

Language:

English

Format:

Digital (PDF)

Searchability:

Searchable PDF text

Printability:

Printable

📖 Manual Coverage

Engine Mechanical:

Yes (EJ20, EJ25, EJ257, EJ255 variants, including turbocharger systems)

Engine Management:

Yes (ECU, sensors, actuators, fuel injection, ignition, emissions control)

Transmission Manual:

Yes (5-speed and 6-speed DCCD options)

Transmission Automatic:

Yes (4-speed automatic for non-turbo models, AWD systems)

Drivetrain:

Yes (All-Wheel Drive system, differentials, driveshafts, hubs)

Suspension:

Yes (Front MacPherson strut, Rear multi-link, STI specific tuning)

Steering:

Yes (Power steering system, steering column)

Brakes:

Yes (ABS, EBD, ventilated discs, STI Brembo calipers)

Electrical System:

Yes (Battery, alternator, starter, lighting, power accessories, wiring diagrams)

HVAC:

Yes (Air conditioning, heating, ventilation)

Body And Trim:

Yes (Body panels, interior components, glass, seals)

Chassis And Frame:

Yes (Frame construction, unibody specifications)

Scheduled Maintenance:

Yes (Oil changes, filter replacements, fluid flushes, belt inspections)

Troubleshooting:

Yes (Diagnostic flowcharts, symptom-based diagnosis)

Engine Repair:

Yes (Head gasket replacement, piston/ring service, valve adjustments, turbo rebuild)

Transmission Repair:

Yes (Clutch replacement, gearbox overhaul, AWD system service)

Brake Service:

Yes (Pad/rotor replacement, caliper overhaul, bleeding procedures)

Suspension And Steering Repair:

Yes (Strut replacement, control arm bushing, power steering pump)

Electrical Diagnostics:

Yes (Component testing, wiring harness repair, ECU flashing)

Bodywork And Collision Repair:

Yes (Panel replacement, alignment, sealing)

HVAC System Repair:

Yes (Compressor, evaporator, heater core replacement)

Wiring Diagrams:

Yes (Comprehensive and color-coded)

Depth:

Comprehensive (from basic maintenance to complete engine/transmission rebuilds, advanced diagnostics)

📊 Manual Specifications

Format Type:

PDF

Resolution:

High-resolution, suitable for professional printing

Binding:

N/A (Digital Format)

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Impreza 2.5I:

2.5L Naturally Aspirated EJ253 Boxer-4

Wrx:

2.5L Turbocharged EJ255 Boxer-4

Wrx Sti:

2.5L Turbocharged EJ257 Boxer-4 (with stronger internals)

Impreza 2.5I Hp:

173 hp @ 5600 rpm

Impreza 2.5I Torque:

166 lb-ft @ 4400 rpm

Wrx Hp:

224 hp @ 5600 rpm

Wrx Torque:

226 lb-ft @ 4000 rpm

Wrx Sti Hp:

300 hp @ 6000 rpm

Wrx Sti Torque:

350 lb-ft @ 4000 rpm

Type:

Multi-Point Fuel Injection (MPI)

Octane Requirement:

91+ octane recommended for WRX/STI; 87 octane for 2.5i

Sti Connecting Rods:

Forged

Sti Pistons:

Forged

Sti Crankshaft:

Nitride-treated forged steel

🔧 Transmission

Impreza 2.5I:

5-Speed Manual

Wrx:

5-Speed Manual

Wrx Sti:

6-Speed Manual with Driver Controlled Center Differential (DCCD)

Impreza 2.5I:

4-Speed Automatic

AWD System Type:

Symmetrical All-Wheel Drive with viscous center differential (front/rear open differentials)

Dccd Modes:

Automatic, Manual (Lock, 50:50, Front-biased, Rear-biased)

📐 Dimensions

Impreza Sedan Length:

4415 mm (173.8 in)

Impreza Hatchback Length:

4405 mm (173.4 in)

Width:

1740 mm (68.5 in)

Height:

1415 mm (55.7 in) for Sedans / 1430 mm (56.3 in) for Hatchbacks

Wheelbase:

2620 mm (103.2 in)

Ground Clearance:

135 mm (5.3 in) for standard models / 145 mm (5.7 in) for STI

Curb Weight Min:

1370 kg (3020 lbs) for 2.5i manual sedan

Curb Weight Max:

1505 kg (3318 lbs) for WRX STI hatchback

Sedan Trunk Volume:

Approx. 390 L (13.8 cu ft)

Hatchback Cargo Volume:

Approx. 320 L (11.3 cu ft) behind rear seats, expandable

🛡️ Safety Features

NHTSA Front Crash Test:

5-Star (for both driver and passenger)

IIHS Side Impact:

Good (for models equipped with side airbags)

ABS:

Standard (Anti-lock Braking System)

Ebd:

Standard (Electronic Brake-force Distribution)

Traction Control:

Standard (VDC - Vehicle Dynamics Control on some trims)

Airbags Front:

Standard (Driver and Passenger SRS)

Airbags Side:

Optional (Front Side-Impact Airbags, Curtain Airbags)

Seatbelts:

3-point front and rear with pretensioners

Child Seat Anchors:

LATCH system

💡 Technology Features

Head Unit:

Standard AM/FM/CD player, optional premium audio system (e.g., McIntosh on some STI trims)

Display:

Basic LCD screen for clock/audio information. No central touchscreen infotainment.

Cruise Control:

Standard

All Wheel Drive:

Core technological feature providing enhanced traction and stability.

Auxiliary Input:

Standard on most models for audio playback.

Bluetooth:

Not available from factory; aftermarket solutions common.

🔧 Maintenance

Oil Change:

Every 3,750 miles (severe) or 7,500 miles (normal) with synthetic oil, or every 6 months.

Engine Air Filter:

Inspect every 15,000 miles, replace as needed.

Cabin Air Filter:

Replace annually or every 15,000 miles.

Spark Plugs:

Replace every 60,000 miles (iridium type).

Timing Belt Replacement:

Not applicable, uses a timing chain.

Engine Oil:

SAE 5W-30 Synthetic (API SG or higher)

Coolant:

Subaru Super Coolant (or equivalent silicate-free OAT coolant, typically blue)

Brake Fluid:

DOT 3 or DOT 4

Transmission Fluid Manual:

Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent

Transmission Fluid Automatic:

Subaru ATF-HP

Differential Fluid Front Rear:

Subaru 75W-90 GL-5

Head Gaskets:

Prevalent issue in EJ25 engines, particularly non-turbo. Turbocharged engines (EJ255/EJ257) are less prone but not immune. Manual addresses proper sealant and torque procedures for replacement.

Oil Consumption:

Some EJ25 engines can consume oil, especially turbocharged variants under hard use. Manual provides diagnostic steps.

Subaru Clutch Wear:

Clutches on WRX/STI can wear faster under aggressive driving. Manual covers clutch replacement procedures.

Catalytic Converter Failure:

Can occur due to engine issues (e.g., oil burning). Manual details exhaust system diagnostics.

Door Seal Deterioration:

Common on older Subarus, leading to water ingress. Manual covers bodywork and sealing procedures.

📚 Vehicle History

Subaru Motorsport:

Long-standing success in rally racing (WRC, Group N)

AWD Legacy:

Pioneer in mass-produced All-Wheel Drive vehicles

Third Generation:

This generation (GD/GG) marked a significant styling evolution, moving to a more rounded and modern design compared to the previous GC/GF generation.

Sti Introduction:

The STI variant was officially introduced to North America in 2004, with the 2006-2007 models representing a significant update, including the EJ257 engine and DCCD transmission.

Manufacturing Location:

Gunma Plant, Japan

Production Years:

2000-2007 (GD/GG generation)

🏆 Awards & Recognition

Car And Driver 10Best:

WRX often featured on Car and Driver's 10Best list in its segment during its production years.

Road And Track:

Frequently praised by automotive journalists for its performance and rally-inspired driving dynamics.

Jis Certification:

Japanese Industrial Standards compliance for various components.