Just did one of the recommendations - changed out the wheels/tires for a brand new set of STi option rims (the 18x8.5" 15-spoke ones for the WRX sport package from 16-21 - got a brand new, still in the boxes set shipped for less than cost!) with Pirelli PZero all season plus 3 tires (245/45-18) - literally had them put on yesterday, but after doing a few 100 miles trips with the OEM Avid GT tires, I decided they were waaaay to squirmy and loud for me. And I wasn't a big fan of the grey wheels that came stock on the 24 Sport.
Wish someone made a rear swaybar - Whiteline has one for the Outback - I figured with the new "global platform" things would be more swappable than ever between cars, but evidently not.