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The most noticeable feature on the STI Sedan is a large rear wing, characteristic of the last generation Impreza STI Sedan. With the new front bumper, the 2011 Impreza WRX STI is more aggressive compared to 2008–2010 models. The 2.5 flat four turbocharged engine with 305 horsepower is carried over, while tweaks in suspension improve handling.
Brembo 4 piston front and 2 piston rear brakes came standard on the STi and were an option on the bare-bones Type RA STi, which still carried the Subaru 4 piston front/2 piston rear brakes as standard. Externally, the STi has a larger hood scoop and has foglight covers with the STi logo embossed on them.
The turbocharger directs air through a larger top-mount intercooler which has lost the red "STI" that was on previous generations. The STI (3,395 lbs) is heavier than the WRX (3,174- 3,240 lbs depending on trim) due to a more robust transmission, rear differential and other chassis reinforcements.
Generally these engines all have the slanted intercooler. Engines from the STI RAs received the upgraded Shim-Under-bucket style lifters unlike the normal HLA buckets the WRX & the WRX STI had. These engines also feature STI factory 8.5:1 forged pistons, lighter valves, the intake valves are marked INKO and the exhaust valves are marked EXKO.
Subaru removed the spare tire and replaced it with a repair kit to help this STI shave some pounds. The Kanrai incorporates a black low-profile lip spoiler, black badging, mirror caps, and shark fin antenna to complement the Ceramic White paint. What makes it pop is the black front grille receives the STI's unique cherry colour. [53]
Front-mounted air-to-air intercooler Top-mounted air-to-liquid intercooler (the silver cuboid-shaped part) on a BMW S55 turbocharged engine. An intercooler is a heat exchanger used to cool a gas after compression. [1] Often found in turbocharged engines, intercoolers are also used in air compressors, air conditioners, refrigeration and gas ...