Subaru has a knack for continuous improvement on its vehicles—particularly its performance-minded Impreza WRX and STI models. And while it rolled out an all-new sporty Impreza WRX and high-performance STI for 2008, it gave the WRX a host of mechanical upgrades for 2009, with a few more tweaks last year. Now, for 2011, both of these rally-themed...

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