Accessport sub - 003 V2 SUBARUUUUUUUUUUU

Sold my Forester XT many months ago but just remembered this is kicking around. Unmarried.

Applications according to Cobb’s website:
*2008-2013 STi
*2008-2013 Wrx
*Legacy GT 2007-2012
*2.5 GT 2009-2010
*Legacy GT Spec B 2007-2009
*Outback XT 2007-2009
*Forester XT 2007-2013

I have a 12 sti, what will this allow me to do? sorry if this is a stupid question

Flash a Cobb tune or have it tuned professionally using it.