I have one on my Flex... There should be pix in a thread from a couple years ago if you do a search.. I used a ROTO FAB "J" pipe I had and added an AEM filter. Secured it to the turbo inlet with a couple pieces of hose and 4 clamps around a hard piece of PVC that was ported at the ends by me, for smooth flow. Have a Red K & N filter cover to finish it off.
May be only "Visual Fluff", but it turned out nice. From what I have read, the stock air box is nearly or possibly better than the aftermarket stuff out. Scrming who posts here, I believe went back to the stock box from an AirAid and got better results.
You can always install a K & N drop in filter in the stock box for improved flow.