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I have FVD set and used screen mesh. I found the hidden hardware and quality of casting to be the only choice for me. As a side note, they also reduced my oil temp (I didn't run them to brakes).
Drilling that hole correctly is my biggest concern.
i just put some masking tape on the inside of the bumper and on the duct over the screw hole. put a blob of white out on the screw hole and lined it up and pressed it against the bumper to mark where the hole should be and drilled. if you get it wrong it doesn't really matter as you won't be able to see the hole (or holes if you get it wrong!) when the duct is in place.
here are the cult werk ducts (unpainted) on black.
i just put some masking tape on the inside of the bumper and on the duct over the screw hole. put a blob of white out on the screw hole and lined it up and pressed it against the bumper to mark where the hole should be and drilled. if you get it wrong it doesn't really matter as you won't be able to see the hole (or holes if you get it wrong!) when the duct is in place.
here are the cult werk ducts (unpainted) on black.
Nice!
I'm leaving mine black. I like the contrast with my guards red.