How the heck do you design one, Ive looked and looked but I dont see anyone call out specifics of the box size and tuning.
I think my next box is going to be a single 15" RD Audio Alphamax off a 3000d in a bandpass with ports into the cabin, similar to shiznilti's lexus
I have room for 2-3 6" ports into the cabin if need be and below is a picture of my trunk.
Directly between the trunk and rear seats is my gas tank so I think the best way is to run some pvc aero ports out of a bandpass box up through the old 6x9 holes in my rear lid (I dont have any rear speakers)
I PM'd 80 Inches but I figured Id post up and get other opinions also, Im open to designs but I want it to be loud.