The 2010 Subaru Impreza WRX STI Special Edition is aimed at the driving enthusiast who is willing to trade a few amenities to gain an extra measure of handling performance over the already extraordinary Subaru Impreza WRX STI. Suspension for the new version of this high-performance machine is adopted from the Japanese domestic market Subaru Impreza WRX STI spec C model, which adds a 1-millimeter thicker rear stabilizer bar, stiffer rear sub-frame bushings plus upgraded and retuned springs. The front springs are 16-percent stiffer, while the rear shocks have been stiffened by 29-percent.