Do not ever go ported if you’re not getting it custom for the sub. You can get away with prefab sealed enclosures, and they will be OK, but far from getting all the bass your sub is capable of. The enclosure makes a much bigger difference than the sub. A 40$ Blaupunkt sub in a custom box will outperform an expensive JL sub in a bad box. If you HAVE to do a prefab that’s too small, get some poly fill and stuff a pound or 2 in the box and keep expectations low. A lot of us on here have done what you are doing, and learned the hard way. I did.