Technology

As the performance flagship of Subaru, STI continues to lead the way in the development of world class, fun-to-drive performance technologies. 

The unique combination of the Subaru Symmetrical All-Wheel Drive system and turbo-charged horizontally opposed Boxer Engine in the third generation Impreza WRX STI  has been complemented by a number of exciting technologies designed to deliver superb performance and total driving control in even the most challenging of driving conditions.

With the World Rally Championship circuit as the testing ground of choice for the past 13 years, STI and the Subaru World Rally Team (SWRT) have been able to directly influence the design the New Generation Impreza WRX STI into the most refined and exhilarating driving machine developed yet.

Impreza WRX STI features a number of innovative technologies designed to maximise overall vehicle performance including handling, stability, safety, ride comfort and design quality. 

That’s why every 2009 Impreza WRX STI comes with a 2.5 litre turbo-charged horizontally opposed Boxer engine producing 221 kW of power and 407 Nm of torque, a Driver Controlled Centre Differential (DCCD), Subaru Intelligent Drive (SI-Drive), Subaru Intelligent Chassis (SIC), multi-mode VDC stability control (VDC) and of course the legendary Subaru constant All Wheel Drive system - a performance package unmatched by any sports car under $100,000.

Some of the Advanced Technologies found in the new Impreza WRX STI:

Power Unit

2.5-litre Subaru BOXER 16-valve Turbo with Dual AVCS

Output Performance
Electronically-control throttle chamber (ETC)
Dual Active Valve Control System (AVCS)
Intercooler
Leterally mounted muffler

Environmental Performance
Tumble Generation Valve (TGV)
Secondary Air System

Drive Train

SI-DRIVE (Subaru Intelligent Drive)
6-speed Manual Transmission
Vehicle Handling Control Mechanism
Multi-mode DCCD (Driver’s Control Center Differential) type AWD
Multi-Mode VDC (Vehicle Dynamics Control) System
Front / Rear LSD’s

Chassis

Front inverted strut suspension
Rear double wishbone suspension 
Brembo ventilated disc brake system 
Brake Assist
Super Sports ABS with Electronic Brake Force Distribution (EBD)
Hill Start Assist System

Body Construction

STI advanced Ring-Shaped Reinforcement Frame Body Structure