Rear Sway Bar (19mm or 20mm), for the 3.6R the 20 is the better choice for the '13-'14.New Outback owner, also. I bought a 2013 about 6 months ago. Still coming lately stock. Looking for upgrades.
The 2.5 has a 24mm front bar vs the 3.6 has a 26mm bar. The smaller 19mm bar is a better match for the 24mm front bar.I have the 2.5.