need a design done up for my 12" mach 5 spl. running 2400rms off a orion 2500D so needs to be solid and braced wanting it double baffle flush mounted. going into a 05 pontiac g6, goal is to get f**king loud for a daily driver listening to mostly rap. was planning on doing a box recommended by mach 5 so 3 cubes at 36hz but if others have had better success with differennt sizes and tuning chime in and lemme know.
options on box would be sub/port facing back of car
or sub up and port back or up but not sure how that is in a car trunk

need a new home for this beast ASAP my 1.8@33hz box gets loud but its too small its for the ixl, wanna start the build tomorow

on the rockford site i got a couple numbers for a box at 4 cubes before displacement so work off these i guess.
height i want at 13.5" internal
width 30-36" internal
depth 12-16" internal

thanks alot in advance for peoples help