There are 2 water outlet holes at the front of the bonnet which chanel the water in front of the radiator - there are also 2 water outlet holes at the rear of the vent. Very minimal amount of water gets into the engine bay, the bonnet has a double skin and most of the water is trapped in the inner skin and feeds down to the water outlet holes at the front of the bonnet. It is not a cosmetic bonnet but a working bonnet to assist greatly with heat dispersion. I have attached a couple of images of both the Aggressor and the Aggressor Shaker bonnet to show you what they look like. Ciao - James