So you're telling me that you did absolutely no cutting of the radiator shroud? I find that hard to believe. ...
Some people had to cut that upper cowl cover shown in my pics above clear off or hack away part of it in order to put things back together. I did not have that issue was all I was implying. No extra cuts for fitment.
View the link and read the installation guide. The only cut required is the one that is in the instructions to make for fitment through the shroud. Alot of people already have this hole to allow air to enter the factory snorkel area as suggested by ModBargains DIY budget mod page and a few other companies. If you do not already have it, yes you need to cut it to fit the BigMouth upper body through it into the factory snorkel inlet.
http://www.velossatechdesign.com/product/2014-2015-fiesta-st-ram-air-big-mouth-intake/