I just got this program and i am trying to find out what my box is tuned to. But i do not know what it is asking for when i have to put in the port length. My box is laying down with my 4 Orion P15d4's upfiring. The boxes VB is 10.4 cubes and 11.3 cubes before any port displacement. I know how to find the Cross Sectional Area i just do not understand what they mean by port length. The port dimensions are 6"W x 32.5"L x 16.25D" when i say wide i mean from driver to passenger side, length is from backseat to hatch, and Depth is when i put a tape measure in the port. If someone could help me find what my total port length is then i can find my tuning so somebody help i have been trying to find this for a while and the numbers keep changing.