Cutting the radiator shroud high at the top could cause air to swirl that can effect the MAF's output

Do not make a cut like the top image but correctly like the lower image with cut low and about 18 inches wide by about 2 inches tall.

Shroud is make of thin plastic so it cuts real easy.
Being the slot is hidden behind the Blackwing which is then hidden by the Icebox the cut does not have to be fine and square.