Here it is, the Kartboy 6-speed short throw shifter. As always, Kartboy has crafted this shifter from TIG welded 4130 chromoly steel. Shortens throw by approximately 40%. Installation takes a little more than an hour. Budget more than that for a 2008+ STI, because some of the interior has to be disassembled to get to it.
Fits all WRX STI 2004 and newer, including 2015 and newer.
(If you have a regular 2002-2014 WRX, you need the Kartboy five-speed shifter.)