Judging by the picture? Fairly sure OP's referring to the lower plastic trim piece on the front facia.What slats exactly?
You mean the AGS or whatever it's called, that is attached to the radiator/intercooler?
It's not needed.
Or the lower opening of the bumper? (Which I think folks cut off for aesthetic reasons)
Well that's a first. I understand the aesthetic stuff, to each his own ya know? But that just doesn't make sense.