The Subaru Impreza STI 2009 represents the pinnacle of the second-generation hatchback's evolution, offering a blend of rally-bred capability and daily-driver refinement that remains compelling over a decade after its introduction. This specific model year solidified the car's reputation as one of the most engaging performance hatchbacks available, combining a race-proven engine with chassis upgrades that enhanced both grip and comfort. For enthusiasts, the 2009 model stands as a mature iteration of the original concept, balancing raw potential with improved usability.
Design and Exterior Evolution
Visually, the 2009 Impreza STI commands attention with its widened stance and aggressive front end, setting it apart from the standard Impreza. The hood features prominent bulges to accommodate the larger intercooler and turbocharged boxer engine, while the iconic chrome-plated grille reinforces Subaru's symmetrical all-wheel-drive identity. The flared wheel arches accommodate the substantial 17-inch alloy wheels shod in high-performance tires, completing a profile that is both purposeful and timeless.
Functional Aerodynamics and Cooling
The design is not merely aesthetic; every element serves a purpose in managing airflow and cooling critical components. A large front bumper intake feeds the intercooler directly, reducing inlet air temperatures for consistent power delivery during spirited driving. The redesigned rear bumper integrates a dual diffuser that accelerates airflow under the car, increasing high-speed stability and reducing lift. This focus on functional engineering ensures the STI performs reliably, whether on a winding mountain road or a long highway cruise.
Performance and Engineering
Under the sculpted hood lies the heart of the machine: a 2.5-liter horizontally-opposed (boxer) turbocharged engine producing 305 horsepower and 290 lb-ft of torque. This power is transmitted through a robust 6-speed manual transmission and sent to all four wheels via Subaru's symmetrical full-time AWD system. The result is explosive acceleration, with the STI sprinting from 0 to 60 mph in just over 4 seconds, a figure that was exceptional for its time.
Chassis, Suspension, and Brakes
To handle the potent power, the 2009 STI featured significant chassis upgrades over the standard Impreza. The suspension was tuned for both improved handling and ride comfort, utilizing stiffer springs and larger anti-roll bars to minimize body roll during cornering. Brembo brakes provided the necessary stopping power, with large front discs inspiring confidence in even the most aggressive driving. The chassis feels planted and responsive, transforming the car into a precise and predictable cornering machine.
2.5-liter turbocharged boxer engine
305 horsepower and 290 lb-ft of torque
Symmetrical all-wheel-drive system
6-speed manual transmission
Brembo braking system with large front discs
Enhanced suspension with stiffer springs and anti-roll bars
Interior and Comfort
Inside, the 2009 Impreza STI blends driver-focused ergonomics with improved materials quality. The seats are bolstered to provide excellent lateral support during hard cornering, yet remain comfortable for longer drives. The flat-bottomed steering wheel, finished in genuine leather, houses audio and cruise controls for convenient operation. Digital instrumentation, including a boost gauge and tachometer, keeps the driver informed about the car's performance at a glance.
