Ok, got the 26mm FSB installed! It feels great and really tightens up the front end. It is even noticible when driving straight over small bumps, less side to side wiggle.
I did need to separate both tie rods to get it installed. Not very difficult, they popped out easily by hitting the knuckle with a large hammer then tapping lightly on the castle nut put on backwards to protect the threads. You could probably get away with just separating just one (as the above LGT.com thread says), but after playing twister for about 5 minutes trying to get it thru the subframe and in the proper orientation I decided it would take less time to separate both tie rods rather than screw around with it for another 20 minutes trying to get it thru.
I highly recommend this upgrade for 2010-2012s, it seems to be a good compliment to the 19mm RSB and the car feels more balanced now. Plus it's a pretty cheap upgrade, it cost me all of $80 plus shipping (I sure wish Porsche parts were as cheap as Subaru!).
I do have the Tanabe front strut top bar, and with a bigger FSB it may be more relevent to have one. One of the "improvements" for 2013 was reinforcement of the front strut top mount points, so the bigger FSB may lend to more flex here if you don't have one on your 2010-12 already. I'd recommend both the 26mm FSB and the strut top bar at the same time.