Promise not to laugh too hard?
I got a little bored and carried away one day. Hides under the license plate bracket real nice for daily duty, but pop the bracket off and you get some more airflow into the coolers and straight into the radiator. I mostly did it to get more air into the tranny coolers when I was running the auto, but now those are converted to power steering coolers.
I'm not sure if air rushing straight through there would affect the re-directed air rushing upward from the air dam.... but I imagine it still offers better cooling regardless.
Thinking about making a semi-scoop to funnel the air mostly towards the oil cooler for track duty.
As you can see, Mike's AL bumper holder upper is almost entirely out of the way, where a stock steel bumper would block half that hole.
AND YES, the teeth are absolutely necessary for the correct airflow pattern.