2011 Subaru Impreza WRX STI Sedan

First Time Subaru Performance Flagship Offered in Two Body Styles:

New WRX STI Four-Door with Wide-Body Design
Retuned Suspension for Even Sharper Handling

New York, April 1, 2010 – Subaru of America today introduced a new 4-door version of the Impreza
WRX STI performance flagship model. This will be the first time that
the WRX STI has been offered in two body styles (5-door and 4-door). In
addition to the new styling, the 2011 WRX STI features heavily revised suspension tuning and lighter 18-inch wheels for even sharper handling.

The
WRX STI has been a recipient of continuous improvement since its
introduction. Most recently, the 2010 WRX STI Special Edition previewed
some of the suspension enhancements now migrated to the 2011
WRX STI. Thorough and painstakingly detailed chassis development,
including testing on Germany’s famed Nurburgring racetrack, has resulted
in the best-handling Impreza WRX STI models Subaru has ever offered.

“The
continuous evolution and development of the WRX STI is driven by the
strong, loyal and vocal support from thousands of enthusiastic owners of
this exciting high-performance vehicle,” said Tom Doll, executive vice
president and COO of Subaru of America, Inc. “The 2011 4-door WRX STI will expand the appeal of this iconic performance model to a wider range of driving enthusiasts.” The 2011 Impreza WRX STI models arrive in Subaru dealerships late this summer.

All-New 4-Door Wide Body Design for 2011
The new WRX STI 4-door
design is based on a “wide and low” concept that gives the car an
aggressive road presence. Like the wide-body design already used for the
5-door WRX STI, the new 4-door WRX STI features widened front and rear
track dimensions and wider, more pronounced front fenders and rear
quarter panels. The design maintains a consistent flow from front to
rear bumper, creating a distinctive identity and a sense of stability.

In front, the 2011
WRX STI models feature sharpened bumper corners and wider, blacked-out
fog lamp nacelles to accentuate the “wide and low” profile. A jutting
lip spoiler with three-dimensional detailing emphasizes the cars’ sporty
intent. The newly designed front grille with a black grille inset and
blacked-out Subaru floating wing also signify the 2011 model and set off the headlights’ shape to give the entire front end a more powerful appearance.

For the WRX STI 4-door Sedan
model, newly designed wider rear fenders are stretched out on the side
more than the tail lamps, and this accentuates a look of stability. A
striking larger rear spoiler was exclusively designed for the STI
4-door. The new design details contribute to an improved drag
coefficient, and the rear spoiler design contributes to stable
high-speed handling and achievement of zero lift. The WRX STI 4-door
features its own version of the polished stainless steel quad-tailpipe
exhaust, with tailpipe diameter enlarged to three inches.

New WRX STI Chassis Tuning for 2011
The Subaru WRX STI was already a highly optimized performance machine. Changes in chassis tuning for 2011
reflect both owner / enthusiast feedback and the brand’s commitment to
keeping this model at the peak of the segment’s performance offerings.
The fundamentals remain the same as before, but specific tuning –
previewed by the 2010 WRX STI Special Edition – results in reduced body
roll, more neutral handling response and higher lateral-G capability.

The
basics: The WRX STI delivers ultra-crisp handling along with everyday
ride compliance. High-tensile-strength steel is used at key structural
points and the suspension-mounting areas. Inverted struts used for the
front suspension provide high bending resistance for quicker and more
consistent performance under hard cornering. Aluminum front lower L-arms
reduce unsprung vehicle weight.

Major changes to suspension tuning for the 2011
WRX STI include a lowered ride height and new pillow-ball bushings in
front and stiffer bushings for the rear subframe that supports the
double-wishbone suspension – these improve camber and toe stiffness.
Both the front and rear suspension systems employ higher-rate springs
and thicker front and rear stabilizer bars than the 2010 model: 21 mm
vs. 20 mm in front and 19 mm vs. 18 mm in rear. (The 2010 WRX STI
Special Edition already had the thicker rear stabilizer.) Spring rates
have increased by 15.6 percent in front and 53 percent in the rear.
(Rear spring rate for the 2011 WRX STI is 18-percent over the already-higher rate rear springs introduced in 2010 WRX STI Special Edition).

New
standard 18-inch aluminum wheels feature high-luster paint and weigh
17.6 lbs less than the previous standard wheels. The optional 18 x 8.5
in. BBS® forged aluminum-alloy wheels are highlighted by silver
high-luster paint for 2011. These wheels further reduce unsprung vehicle
weight. Dunlop SP600 245/40R18 summer performance tires are used with
the standard and optional wheels.

Performance Evolution
The 2011 WRX STI continues as the ultimate-performance Subaru
with its high-boost 305-hp turbocharged/intercooled Boxer engine teamed
with a 6-speed manual transmission and the exclusive Multi-Mode Driver
Controlled Center Differential (DCCD) version of Symmetrical All-Wheel
Drive.

The WRX STI is equipped with advanced dynamic control systems, including Subaru
Intelligent Drive (SI-DRIVE) and Multi-Mode Vehicle Dynamics Control
(VDC) system, which features a track performance-optimized mode. Incline
Start Assist, featured on all Impreza
models equipped with a manual transmission, can momentarily prevent the
vehicle from rolling backward when being driven away from a stop on an
incline.

SI-DRIVE Gives WRX STI Driver More Control
Exclusive to the WRX STI models, Subaru
Intelligent Drive (SI-DRIVE) technology allows the driver to tailor the
car’s driving characteristics by choosing from among three selectable
modes – “Intelligent,” “Sport” and “Sport Sharp” – using a rotary dial
on the center console. SI-DRIVE alters vehicle performance
characteristics by regulating the Engine Control Module (ECM) and by
fine-tuning the Electronic Throttle Control system.

With
Intelligent mode selected, SI-DRIVE provides a more relaxed throttle
response curve, making it useful for commuting in traffic, for example.

“Sport”
mode provides quick throttle responses and powerful, linear
acceleration, making it ideal for everyday sporty driving. In “Sport
Sharp” mode, SI-DRIVE modifies the engine’s electronic throttle mapping
to deliver super-quick throttle response and put down the power sooner.

Multi-Mode DCCD All-Wheel Drive with Three-Mode Vehicle Dynamics Control As before, the 2011 WRX STI is exclusively equipped with the Multi-Mode Driver Controlled Center Differential (DCCD) version of Subaru
Symmetrical All-Wheel Drive. The system employs planetary-type
differential gears with a nominal 41:59 torque split. A mechanical
limited-slip type center differential augments an electronically
controlled center differential to enhance torque transfer performance. A
steering sensor input enhances torque transfer response by accurately
relaying the car’s cornering situation. A helical-type limited-slip
front differential and a TORSEN® torque-sensing limited-slip rear
differential optimize side-to-side power distribution, helping to
prevent the inside wheels from slipping during cornering.

The
DCCD AWD system features three automatic modes. “Auto” mode provides
the best all-around performance for most drivers and circumstances,
varying the front/rear torque distribution automatically via the
limited-slip type differential in response to vehicle acceleration,
deceleration, steering angle, cornering force and wheel slippage. The
“Auto (-)” mode makes less use of the center limited-slip differential
(less locking factor) and holds the torque bias to the rear more
frequently, which yields more handling-oriented steering
characteristics. For driving on slippery surfaces, such as gravel or
snow, the Auto (+) setting tightens the LSD. In manual mode, DCCD offers
six levels of center differential locking, allowing the driver to vary
the front-to-rear torque distribution (up to 50:50 maximum) to optimize
AWD performance for varying driving conditions.

The Vehicle Dynamics Control (VDC) stability and traction control system is standard on all Subaru models for 2010. It is important to note that, in Subaru
vehicles, traction control plays a second line of defense against wheel
slip after AWD torque distribution. In contrast, some All-Wheel Drive
systems on the market lack the performance advantage of a locking center
differential and rely solely on traction control to redistribute torque
away from slipping wheels.

Exclusive
to the WRX STI, the Multi-Mode VDC system offers the driver three
settings: “VDC Normal,” “Traction” and “Off.” The “Normal” setting
provides the highest level of system engagement, utilizing traction
control (TCS) and VDC. The “Traction” setting is more
performance-oriented, employing less-restrictive VDC and disengaging the
engine torque-reduction control. The “Off” setting disengages the VDC
and the traction control functions.

Also
exclusive to the WRX STI, the Brembo Performance Brake System uses
ventilated 4-wheel Super Sport anti-lock (ABS) disc brakes with
Electronic Brake-force Distribution (EBD). Front discs measure 13.0
inches in diameter and use 4-piston, fixed-position calipers; the 12.6
in. rear discs use 2-piston, fixed-position calipers. Taking input from a
lateral g-sensor, a steering angle sensor, a yaw sensor and a brake
pressure sensor, Super Sport ABS can control the braking forces at each
rear wheel independently, which optimizes braking ability during hard
cornering to help reduce understeer. In contrast, conventional ABS
systems control the rear wheels as a pair, reducing the braking force to
both rear wheels equally.

Sporty, Spacious and Versatile Interior
New for 2011, the WRX
STI interior is finished in black and silver to highlight its sporty
design. The color of each ****llic part was unified to dark ****llic and
sharp silver. Trim panels, steering wheel air bag cover and steering
wheel switches are now dark cast ****llic.

The
standard tilt and telescopic steering wheel is a three-spoke,
leather-wrapped design embossed with the STI logo in its center. The
wheel features control switches for Bluetooth® hands-free phone
function. The WRX STI models are equipped with standard aluminum-alloy
pedal covers and driver’s footrest. Performance-design front seats
integrate the backrest and head restraint into a single structure. The
instrument panel electroluminescent gauges use indicator needles that
sweep the gauge faces upon engine startup.

The
compact layout of the double-wishbone rear suspension helps to minimize
intrusion into the cargo area, providing a wide and deep luggage
compartment. In the 5-door models, the wide and flat load floor can
accommodate two Tour-size golf bags with the rear seat backs in the
upright position. In the 4-door Sedan
model, which is 6.5-inches longer than the 5-door, the extra space
provides for a larger, deeper trunk that can accommodate three Tour-size
golf bags. A 60/40-split folding rear seat further boosts cargo
capacity and convenience, and the 4-Door also features a rear seat
fold-down center armrest.

Standard
amenities that help make the WRX STI an excellent everyday driver
include an automatic climate control system with cabin air filtration
and an AM/FM stereo with single-disc CD player that features Bluetooth
audio streaming and hands-free calling, iPod control capability, a USB
port, 3.5mm aux. input jack and XM/SIRIUS satellite radio capability. A
vehicle security system with engine immobilizer is standard, as well.
The optional navigation system integrates a vehicle information center
and Bluetooth® hands-free calling. In addition to an input for MP3
players, the center console also includes video jacks that can
accommodate portable gaming devices. These can be displayed on the
navigation screen when the vehicle is parked. All WRX STI models come
pre-wired for XM® or SIRIUS® Satellite Radio.

Subaru Safety
Electronic Brake-force
Distribution (EBD) provides precise control of braking pressure between
the front and rear wheels based on the vehicle load to improve stability
and stopping distances. Brake Assist analyzes the force and stroke on
the brake pedal and increases hydraulic boost to provide enhanced
emergency braking, also activating the ABS system early if needed.

All Impreza models utilize the proven Subaru
Ring-Shaped Reinforcement Frame body structure with front and rear
crumple zones, and all feature standard side-curtain airbags. The Subaru
Advanced Frontal Airbag System (SRS) features front seat side impact
air bags. In the passenger side front seat, a sensor module detects
weight – first determining if the seat is occupied, and if so by a child
or adult – to control air bag deployment. There are 3-point seatbelts
for all seating positions, including front height-adjustable seatbelts
with electrically triggered pre-tensioners and force limiters.

About Subaru of America, Inc.
Subaru of America, Inc.
is a wholly owned subsidiary of Fuji Heavy Industries Ltd. of Japan.
Headquartered in Cherry Hill, N.J., the company markets and distributes Subaru
Symmetrical All-Wheel Drive vehicles, parts and accessories through a
network of more than 600 dealers across the United States. Subaru
produces the best-selling All-Wheel Drive cars in America and all
products are manufactured in zero-landfill production plants. Subaru
of Indiana Automotive Inc. is the only U.S. automobile production plant
to be designated a backyard wildlife habitat by the National Wildlife
Federation. For additional information visit www.subaru.com. Subaru of America, Inc. is a wholly owned subsidiary of Fuji Heavy Industries Ltd. of Japan

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