if the specs say 2.0 cu ft box with a 4'' port thats 10.75'' long. does that mean i can build a box thats 2.0 cu ft and add the port. or do i have to take in consideration the amout of volume to port will take up and make the box a little larger than 2.0 cu ft?
Most manufacturers that recommend port size along with box volume are giving a gross volume to build. Basically, build a 2 cu ft gross box and put the port and sub in.