how- 2 piece of acrylic one for the mounting to the case and the other for the fans, i got it done at a friend shop as he runs a modding and wcooling store here...
why- i did it bcoz i almost blew money away for a murdermod mark2 but decided i cld built something similar but its mine own, to call borrow the dual fan idea from them,
its not abt performing better nor quieter as they just for exhaust , those are just 1600rpm yate loon fans.... mostly for aesthetics