I am using the re enclosure calculator and came up with this 4.108cf @33.8Hz with 58.5in of port the box is 30" wide 14.5" high 25" deep and a port that is 4.5" wide and cut to 19" long and how mutch will my sub Displacement of .16cf change the tuning of the box and the subs will have about 800 watts to them in the trunk of my lincoln LS how do you think it will sound will it hit to low notes that I wont the subs have a hard time hiting them in the 2.5cf seald box they are in right know dont get me wrong the subs are nice in a seald box but I wont to shake my car apart from the low nots and my box now will not do it