I also fabricated a front license plate holder from about $0.50 worth of aluminium and attached it with nylon cap screws [saved at least 0.05 gm of that nasty weight] While I, like NSXtacy, was concerned about airflow though the radiator, a 4200 mile trip from Denver to Sodus Bay, New York, through 11 states and Canada in June and July of this year, in a few days of rather hot weather proved the water temperature was at the same point before I installed the plate.
I even considered drilling holes in the plate for air to pass through, but since they changed the license plate background color from dark green to white, that was no longer an option.
I took back roads nearly the whole way and red lined 3rd gear at least 100 times. [You have to be sure you are passed the slower vehicle before pulling back into the right lane!] We won't talk about a run to 140 in Kansas on the way out and 150 in Nebraska on the way back. Who can hear wind noise at 8 grand in 4th gear! If only the rev change was the same from 1st to 2nd as it is from 4th to 5th!
Drive these things!