if you have a jdm zenki bumper with the hole for smic then the shroud should line up with the hole. Make sense? The shroud or duct is designed to take air in through that hole in the bumper and direct to the intercooler.
for whatever reason, I had to trim mine b/c it poked through. Don't know why though.
PS - if you ever want to sell that JDM S13 zenki bumper let me know
