Porsche left the front bumper air intakes wide open on the water cooled models, which offers a dramatic, aggressive look, but also exposes the radiators to all manner of debris. Due to their low position on the car, this leaves the radiators especially vulnerable. These wire mesh grilles from Rennline fill the space and offer a subtle visual improvement to your 911 while protecting the radiators from stones, leaves, bugs, and whatever else the open road will quite literally throw at it.. High-quality Rennline components are trusted by Porsche enthusiasts everywhere for their clever blend of appearance & functionality. These air intake grilles are no different - they look like something the factory should have installed! They install without drilling, and leave no exposed hardware behind, resulting in a clean, OE-style installation.