Depends on the box, port noise and shit tuning will kill any ported sub. I love the Fi but 18s are a bit ridiculous for me, I think the L7s would be a bit more musical. I did 4 ported L7s with 1000w/ea in a friend's expedition, woofers firing up slot port back and it sounded pretty docile at low volume but pounded when you cranked it up. Those were the old L7 new ones sound way better.