for my intake i use panty hose to put over it for the dunes and when i go in the desert.... i think im going to do the mudflap mod like you haha.... very smart!
It wasnt too hard. The sand wasnt as much of an issue for me. You want to upgrade to an AFE or a K&N so you can constantly clean before and after sand. It was driving in the rain that I had to fix. Any bit of water in the road ended up straight on my air filter. After the first time it rained I looked in my airbox and there was a puddle. Bad news! By the looks of your photo there it will keep the mud out too lol