teyjizzle

have a 2018 ford focus st and have 4 12 ix series skar subs that i need a box for.  i don't understand what size box i need and etc.  max deminsion are 35 width 23 depth and 18 height.  the trunk is slanted front back seat so the bottom is 26 inch and then goes vertical slant to 23 plausible to make it down fire lol jk.  just need help on what size and how many cubic ft need want ported which is gonna be a stretch for that space put will be custom