The standard automatic climate control system integrates cabin air filtration. SIRIUS Satellite radio availability enhances the versatility of the standard 120-watt AM/FM premium stereo, which includes a 6-disc in-dash CD changer and six speakers.  



Rally Tested and Road Ready

All Impreza WRX STI models are powered by a turbocharged and intercooled 2.5-liter DOHC Boxer engine producing 293 horsepower at 6,000 rpm and 290 lb.-ft. of peak torque at 4,400 rpm. The Subaru Active Valve Control System (AVCS) variable valve timing technology helps provide strong torque characteristics throughout the engine's operating range. A manually operated water spray feature helps to bolster intercooler efficiency during spirited driving.

All Subaru Impreza WRX STI models are exclusively equipped with a 6-speed manual transmission that features carbon-plated double-cone synchronizers on 4th, 5th and 6th gears to help ensure durability.



Driver Controlled Center Differential (DCCD) All-Wheel Drive

From its launch, the WRX STI has been equipped with one of the most advanced and most performance-directed All-Wheel Drive systems on the market, regardless of vehicle segment. The Driver Control Center Differential (DCCD) Symmetrical All-Wheel Drive system uses a planetary-type center differential to provide a 41:59 torque split, with automatic and manual differential modes.

Center differential lock-up is controlled by both a mechanical limited-slip type differential and an electronically controlled limited-slip differential. The mechanical limited-slip differential activates and operates initially in response to changes in engine torque, improving overall vehicle stability when accelerating or decelerating. In automatic mode, the electronic limited-slip differential controls the differential lock-up by evaluating the amount of lock-up in the mechanical limited-slip. The total amount of lock-up is based on the combination of both differentials. A steering sensor input improves torque transfer response by more accurately relaying the car's cornering situation.

Set in automatic mode, the DCCD system can vary the torque distribution ratio as needed in response to vehicle acceleration, deceleration, steering angle, cornering force and wheel slippage.

In manual mode, DCCD allows the driver to select center differential lock-up to optimize All-Wheel Drive performance for varying driving conditions. The driver first selects manual mode with a console-mounted button and then turns a thumbwheel on the center console to select from among six levels of lock-up. Increasing the locking factor keeps more power at the front wheels (max. 50:50 torque split with 100 percent lock-up selected), which the driver might want in certain driving conditions or on particular road surfaces.

A helical-type limited-slip front differential and Torsen limited-slip rear differential help to optimize power distribution side-to-side, helping to prevent the inside wheels from slipping during cornering.



Competition-Bred Chassis

A super-stiff Ring Frame Reinforced body structure with a hydroformed front subframe provides the foundation for the high-integrity Impreza platform. Compared to the standard WRX models, the WRX STI models are lowered by 0.4-inch to help lower the center of gravity.

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