ive got 2 12; pionerrs ported and they sound great, it just depends what kind of sound your looking for... unless you have aftermarket tweeters or 6x9s or something i would go with sealed... thats my prefrence, no matter what it would be a great idea to get new inside speakers if possibble
I had two 10" L5's in .9 cubic sealed boxes. Depending on the type of music I thought they sounded fine, a lot cleaner stuffed with poly fil. though i'm not terribly picky about sq.