Bumper vent inserts. Made of high grade ABS plastic with precision CNC cutting.
Additional holes in front bumper can be used to better cool the main radiator, as well as when installing additional oil radiators or an intercooler. It can also be used on rear bumpers, to reduce "parachute" effect . May also be a part of your project stylng, making it looks more sportish and agressive. See picture for details.