Posted December 21, 200816 yr I have a 2003 Chevrolet Tahoe and I am going to put a Fi BL 18" in it.It will be powered with a Rockford Fosgate T10001bd amp and a Kinetik battery.Just ordered it yesterday I have a general idea of the specs on my box in order to fit the 5-10 cubic feet.It will be about 9 cubes by the time everything is displaced.The only problem since I am new to car audio and this is my first system is what are the dimensions of the port?The box will be W 45" x H 20" x D 20" with 3/4" MDF.I want to tune the box to 32Hz.Any help will be appreciated.-Kasey