Subaru debuted the turbocharged WRX performance variant of the third generation series alongside the mainstream naturally aspirated models on April 2, 2007. For this generation, most markets adopted the abbreviated name "Subaru WRX", although the Japanese and North American markets retained the full "Subaru Impreza WRX" title. The 2.5-liter EJ255 engine is largely unchanged, with a power output of 169 kW (227 hp) and 320 N·m (236 lb·ft) from its 2.5-liter engine. As with previous versions, only manual versions are offered. The weight of the car also has been lightened and gives the WRX a 0 to 100 km/h (0 to 62 mph) time of 5.8 seconds. In contrast, curb weight of the standard Impreza model is around 27.2 kg (60 lb) heavier. The STI is lighter than the WRX trim level. For the US market, the WRX was offered in "base", Premium, and Limited trim levels. In Australia, the WRX is available as a sedan or hatchback. An optional premium package adds the satellite navigation with DVD player and 7-inch screen, leather upholstery and a sunroof. It competes with the Mitsubishi Lancer Evolution. Subaru also manufactures the highly acclaimed BRZ coupe.
In response to criticism that the third generation WRX suspension is too soft, and needing to keep on par with rival car companies new releases, Subaru issued several changes in 2008 for the 2009 model year. The EJ255 engine received an output boost to 198 kW (265 hp) and 331 N·m (244 lb·ft) of torque by swapping the previous TD04 turbocharger to an IHIVF52. This lended to the car now achieving a 0-60 time of just 4.7 seconds, as tested by Car and Driver. In addition, the updated model received stiffer suspension parts from the STI and an aerodynamic package. Cosmetic changes included an updated mesh grill with WRX badge and darker wheels.
Further changes in 2010 for year model 2011 saw the WRX gain the wide-body shell from the STI, as well as the addition of quad muffler tips with diffuser. The new model gains 15 kilograms (33 lb). Firmer rear sub-frame bushings and wider 17-inch wheels contribute to improved traction.
WRX STI
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-literEJ207 engine with twin scroll turbocharger generating 227 kW (308 PS). Export markets receive the higher-displacement 2.5-liter EJ257 unit with the single-scrollVF48 turbocharger rated at 221 kW (300 PS) and 407 N·m (300 lb·ft) of torque. The turbocharger directs air through a larger top-mount intercooler which has lost the red "STI" that was on previous generations. It is the first STI to feature automatic transmission.
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. Furthermore, Subaru has utilized aluminum suspension components for the STI. Electronic modifications include a multi-mode electronic stability control with "normal", "traction", and "off" modes; Subaru Intelligent-Drive (SI-Drive) with three modes: "intelligent", "sport", and "sport sharp"; and multi-mode driver controlled center differential (DCCD). The DCCD enables driver to switch between manual and automated torque distribution ratio of the center differential. This distribution can vary from 35/65 to 50/50 front/rear.
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. Australia also received the 2011 model year STI as a sedan to compliment the hatchback released in 2008. Australian STIs were offered in standard form, plus the STI spec.R. An electric sunroof, leather upholstery, satellite navigation, and BBS wheels are standard on the spec.R, while Recaro seats are optional.
A facelift of the STI arrived in 2010 for the 2011 model year, distinguished by a new front bumper. Tweaks to the suspension—stiffer springs, larger anti-roll bars, new pillow ball bushings on the front lower arms, as well as wider standard tireshave—have had the affect of improved handling.
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.
Subaru launched the "WRX STI A-Line" with a five-speed semi-automatic on February 24, 2009. Initially available only in Japan and Singapore, the A-Line features include steering wheel-mounted paddles. The A-Line is also offered in Hong Kong, and later in Indonesia with debut at the Indonesia International Motor Show in July 2010, and was exported to Australia in 2011.
Subaru in the United Kingdom unveiled two new WRX STI models at the British Auto Show that have specific tuning by Prodrive. The first is the "WRX STI 330S", producing 243 kW (330 PS). The second of the two was the "WRX STI 380S", which features new wheels and an upgraded body kit and was expected to produce 279 kW (380 PS). Subaru announced, on September 10, 2008, that the 380S variation would not be produced, due to homologation and specification difficulties. However, the regular 330S model did enter production as the "WRX STI Type UK". This car even trumps cars like the McLaren MP4-12C, the Ferrari 458 Italia and the Lambo Gallardo in acceleration.
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. With a low weight, it has a high power to weight ratio, which gives it BMW M6 like performance.
Available for the UK market only, the "Cosworth WRX STI CS400" was announced in late May 2010. Only 75 units were built, with power deriving from a 294 kW (400 PS) Cosworth-tuned version of the standard STI engine. 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 Bilsteinstruts 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.
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