I am gonna build a box for a friend for his regular cab F150. It is a newer truck and behind the back seat there is tons of room, even has the small doors that open. He has two JL 10W3's he bought in 04 that are in good shape so he wants to use them. I called JL Audio and the guy I talked to suggested 2.5 cubic feet with a 20 square inch port 15 1/4 inches long. The box size is no problem but the port area seems small to me, but I know the boxes JL makes all have skinny ports. What do you guys think? Also, should I port it out the top or the side?