wanna know myself but need to think about water getting it from there on rain days etc

Well you will firstly have to cut the area behind the grill in the bonnet to allow any air to pass through which will also, as oze-ford mentioned, let water into the engine bay.

You could in theory, drill holes into the grill as well as the bonnet, then build a custom primary air scoop that diverts air towards the intake snorkel...the water that enters will be collected at the bottom of the air box which will eventually drain.

I doubt you will see any benefit from it though, but it will be something different. You're better off getting something like a SS induction (the one that runs over the top of the thermos) to feed more air in...or you can just make one up if you're more inclined with custom made stuff.