I have had three vented bonnets since owning my GTR two of which have been z tune style.
The first Z tune style one was a brought here locally in Australia for relatively "cheap" and the quality reflected the price in my opinion. Had it test fitted to the car in the panel beaters in preperation for painting and over night it rained as it does here in north QLD. Well that was the end of that bonnet the whole engine was wet not happy. I do admit
It did come with a cover that goes over the vents when it
Rains but I'm not keen on that idea. As the rain just pools up in the cover and when its on it defeats the whole purpose of having a vented bonnet. So home I go to order the Nismo R Tune bonnet.
It turned up a month or so later and as stated above the build quality is unbelievable. It has the rain channels built into the bottom skin, practically no water gets into the bay unless you directly point the hose in there when washing. I've had some quite tropical days here and never had an issue with water in the engine bay with the nismo bonnet. But the again you do get what you pay for I guess.
Hope that helps
Cheers Kingy