Yes, the port area is removable so that the subs can come in and out. The port housing is bolted down which is the silver bolts you see in the final 2 photos.
If I remember correctly, a Sundown Audio amp.
Here is another 4th Order BP we just completed for 4 18" RD Audio HW's. It is 21 cubic feet for the bed of a Chevrolet Avanlanche.
http://www.importatlanta.com/forums/...olet-Avalanche