DIY: 2016 Crosstrek 20mm Upgrade Subaru STI Sway Bar Install/Review Video
Installed the OEM Subaru STI 20mm sway bar (with new larger bushings) a few nights ago when I got home from work. This is available at any dealer as individual parts or as a kit at some (got mine at subaruonlineparts.com). Nice little upgrade and takes only about 15 minutes to install.
Did this as well and love it along with a strut brace up front and wider tires. Keep in mind this will limit suspension travel. Since 90% of the time I am on pavement especially two lane hardball here in NC it works for me. When I do go off pavement it is gravel roads/dirt trails and the beach no real serious off-roading so I have had no negative impact from that perspective. But the handling and the car keeping planted is super. And this mod is really too easy - great video well worth it.