Airbox, pffft, why ? just put a real intake on it, allows for better spool. But if you wanted to mod the bottom of the airbox to fit the pipework it would be a 10minute job, literally.
There is so much space on the drivers side its not funny.
I already had an intake off a 05wrx i had used on something else that just fitted right on

.
Cold air intake plus a FMIC = win, great spool, and something that cools the air.
I actually did some intake logs yesterday.
Ambient Temp was 26degrees
running sports sharp full boost intake temps were:
highway: 29degrees
town: 35-40 degrees depending on how long i had to come to a standstill, these could keep getting higher if it was stop start traffic.
Seeing as this is cheaper then almost all TMIC's, easy to put in, and completely owns them on cooling i cant imagine why anyone would waste time/money on a aftermarket tmic.
As for the engine cover going back on, the bend coming off the turbo prevents this from happening, but simply rotating the turbine housing will achieve this. I CBF spending the 30mins that will take as I will be changing turbo's at some stage soon.
Hope i answered all the Q's.
Dan