hello there just a quick question. how hard is it to convert a bov (release to atm) --> recirculating?

i searched and found out about an adapter kit? is it true? is it a simple mod? sorry if its a noob question...Im thinking about going FI but im no fan of the loud hissing sound of aftermarket bov.

Im thinking of getting the dezod kit especially that its on sale...hehe, but im not even sure if its worth to FI the tC.. hehe..thanks!