I have a used red IAG AOS v1 with parts for both street and competition series. This was installed on 2014 STI from 5000 - 60000 miles. I destroyed the Y breather fitting while converting back to stock. Also, I recommend all new tubing, but I can ship my used precut tubing if you'd like.

I'm also looking to downgrade to a grimmspeed AOS. I took off my AOS to pass CA smog and I'm too lazy to put it back on. I don't track, so the lower tier Grimmspeed AOS should be good enough and its easy for me to swap in and out for smog in the future.

If you are interested, LMK and I'll text you some photos.