No 2.5i runs...lol. As the owner of a 2013 2.5i CVT the only way it will ever run a good time is doing the following. Remove spare tire and jack and everything else you can live without. Fill you're tank to no more than 1/2. As for mods a header with a straight pipe " weight" and a Grimspeed pulley, I would leave the air box, unless it is drawing hot air. Now here is the secret the CVT will run to 5600 and won't move, now if you put it in manual and DO NOT USE THE PADDLE SHIFTERS, and let it shift at 6000 off the governor. Your 8.6 is now a 7.6 or better. The legacy was bought as a work car, it is not a GT it is a GGG. " Grandma's Grocery Getter.
