They are similar in shape.Would it be possible to modify the oem box by adding a bit of DIY duct work? Or is the box different in shape compared to the old 11-13 non ST? I'm just curious...
The OEM bottom box is longer and smaller at the bottom, that might make it more difficult to attach a duct.
It is however made of ABS plastic and therefore the bottom could be cut off, a new bottom panel could then be glued on with a duct hole.
I suppose that anything could be done.
I have heard that people with ideas built complete cars in their workshops, to then become major automobile manufacturers.