The STI sedan returns and retunes with suspension upgrades.In the wake of the news that all 2011 Impreza WRXs would be getting wider tracks and STI-inspired wide-body styling, we figured the nails were already being driven into the STI’s coffin.The upgrades made to create the 2010 STI Special Edition were only the beginning; the ’11 STI goes further with an even more aggressive suspension to