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Debuting at the Tokyo Auto Show in October 2007, WRX STI versions build further on the standard WRX cars. The STI available in Japan is fitted with the 2.0-liter EJ207 engine with twin scroll turbocharger generating 227 kW (308 PS).
Like the standard WRX, the third generation model was shortened to "Subaru WRX STI", with the Japanese and North American markets notably abstaining from this convention. To differentiate the STI from the regular WRX, Subaru opted to manufacture the STI with a wider body and therefore track—as noted by the flared wheel arches.
The release for the STI hatchback in the United States occurred in March 2008. In 2010 for the 2011 model year, the WRX STI became available as a four-door. The most noticeable feature on the STI sedan is a large rear spoiler.
A facelift of the STI arrived in 2010 for the 2011 model year, distinguished by a new front bumper.
Surfacing at the MotorSport Japan 2008 auto show, the Subaru Takumi concept previewed the "20th Anniversary Edition WRX STI". The only visual cues to differentiate the Takumi from the regular STI are a blacked-out rear spoiler, front lip spoiler, and 12-spoke wheels. The upgraded parts included on the car are drivetrain and suspension modifications. All 300 examples of the 20th Anniversary were exclusive to the Japanese market.
The "WRX STI spec C" was released in Japan on July 23, 2009. The 900 units limited edition has engine, suspension, and body parts improvement over the regular model. The ball bearing on the turbine axle had been modified to reduce friction, the ECU had been retuned for better response, and an intercooler water spray was fitted to prevent rise in the air temperature. The cross member, suspension and power steering were also improved for better handling and body rigidity. An aluminum hood, laminar window glass, and a lighter battery helped to reduce weight.
For 2010 model year, Subaru of North America introduced the "WRX STI Special Edition" similar to Japanese STI Spec C. Fitted with stiffer suspension and a thicker stabilizer bar for better handling, it also gains seven twin-spokes gray 18-inch alloy wheels. Inside, the Special Edition received downgraded manual air conditioning and a four-speaker stereo instead of climate control and 10-speaker premium audio on the regular WRX STI.

Available for the UK market only, the "Cosworth WRX STI CS400" was announced in late May 2010.[13] Only 75 units were built, with power deriving from a 294 kW (400 PS) Cosworth-tuned version of the standard STI engine.[14] Stylistically, the CS400 can be distinguished from the regular STI by its upper mesh grille with piano black finish on the top frame, modified front bumper with "Cosworth" emblem on the lower mesh grille, 18-inch alloy wheels, lip front spoiler, and rear waist spoiler. To match its performance, the CS400 comes with Bilstein struts and Eibach springs for better quality ride and handling. Braking was updated by AP Racing's larger diameter ventilated front brakes with six-pot calipers. Inside, the CS400 has Recaro leather seats with "Cosworth" label, piano black center console panel, and "Cosworth"-badged floor mats.
While Subaru offers many models with a trim level labeled "STI" or "Tuned by STI," there have been several special limited edition STI models.[1]

STi was also known for its exceptional quality in producing cars designed for rally racing. Subaru pulled out of the WRC in 2008.

1990 LEGACY GT Touring Wagon - STI Version - Limited to 200 units.
1990 LEGACY RS Type RA - STI Version - Limited to approximately 300 units.[2]
1994 IMPREZA WRX STi
1998 IMPREZA 22B STI version - Limited to 400 units.
2000 IMPREZA S201 STI version - Limited to 300 units.
2001 FORESTER STI II Type M - Limited to 800 units.
2002 LEGACY S401 STI version - Limited to 400 units.
2002 IMPREZA S202 STI version - Limited to 400 units.
2004 IMPREZA S203 - Limited to 555 units.
2005 LEGACY tuned by STI - Limited to 600 units.
2005 IMPREZA S204 - Limited to 600 units.
2006 LEGACY tuned by STI - Limited to 600 units.
2006 IMPREZA WRX STI spec C Type RA-R - Limited to 300 units.
2007 LEGACY tuned by STI - Limited to 600 units.
2008 LEGACY S402 - Limited to 402 units.
2008 IMPREZA WRX STI "STI 20th ANNIVERSARY" - Limited to 300 units.
2009 EXIGA 2.0GT tuned by STI - Limited to 300 units.
2010 FORESTER tS - Limited to 300 units.
2010 IMPREZA WRX STI tS - Limited to 400 units.
2010 IMPREZA R205 - Limited to 400 units.
2010 LEGACY tS - Limited to 600 units.
2011 IMPREZA S206 & S206 NBR Challenge Package - Limited to 300 units
http://en.wikipedia.org/wiki/Subaru_Impreza