The 2012 Subaru WRX STI continues to be available in 4-door and 5-door body styles. Also, the 2012 WRX STI continues to use the same chassis tuning set up that was debuted in 2011, including higher-rate springs, thicker front and rear stabilizer bars, new pillow-ball bushings in front and stiffer bushings for the rear subframe that supports the double-wishbone suspension. The WRX STI is powered by a 2.5-liter turbocharged intercooled 4-cylinder Boxer engine, with Dual Active Valve Control System (Dual AVCS). This engine is used exclusively on the STI model, it produces 305 horsepower at 6,000 rpm and 290 lb.-ft. of peak torque at 4,000 rpm. Teamed exclusively to a 6-speed manual transmission, the 2012 Subaru Impreza WRX STI has estimated city/hwy fuel efficiency rated at 17/23 mpg. The 2012 Subaru Impreza WRX STI rides on 18×8.5-inch cast aluminum-alloy wheels. Whereas, the Subaru WRX STI Limited 4-door and 5-door ride on 18×8.5-inch BBS aluminum-alloy wheels. All WRX STI models come with Dunlop SP Sport 600 summer performance 245/40R18 tires.