For the first time in THREE years Subaru offers a sedan version of WRX STI New for the STI in 2011 is an improved suspension consisting of stiffer bushings, stiffer springs, and thicker anti-roll bars at both ends of the car. The 2011 STI also sports less unsprung weight than the 2010 model due to lighter 18-inch wheels that are a combined 17.6 pounds less heavy. While power is unchanged (305 horsepower and 290 pound-feet of torque), high-speed stability of the four door is greatly improved, as is at the limit handling, by - you guessed it - that mega wing.
Since the sedan is marginally lighter than the five-door, 0-60 mph times might improve. However, since there's less weight over the rear wheels (and since the STI's diff is slightly rear-biased) they might be a bit slower. Also, the sedan STI features two mufflers (still has four pipes) as opposed to the wagon's one giant muffler (and four pipes). Subaru claims that while this has no bearing on horsepower or torque, it makes the car sound, "Meaner and louder."
