I have an 02 f250 crewcab and what i did is take the back seat out and moved the seat foward on the mounting brackets about 1.5-1.75 inches. pretty easy just had to drill 4 new holes where i wanted the seat to bolt to the bracket to move it foward. After that built a custom sealed box for 2...
well say you go with the ID spec box size of 1.5ft^3 tuned to 30hz. should 1 use Ids recommendation of 3" round at 8.3" long or winisds rec. of 3" x 13" or a 4"x21"
i did some research on this amp awhile back it should do close to rated power. i read a german article that tested it at 14xx watts at 4 ohms. suppose to be a really good amp i found 1 for around $250