It's a tough call. FMIC will allow you more room to expand.
How come you want to go with the 18g?
LOL, why not? Its either that or 8cm Evo 3 16G. idk yet, but the 2 of them are REALLY close. But its a nice level between power and spool, thats why. I really dont want more than 350whp, thats all you ever could ask for on the street in a DD.
LOL, 3 hrs later and im leaning back toward FMIC. LOL! Why cant there be a good concrete difference between them AAAAHHHHH! There so close. I think ill just call my tuner (local guy that is a god when it comes to Subaru tunes, been flown out around the country to tune scoobies) and ask him to make the tough call. LOL, besides I need to schedule the dyno day