I hat to reply without a solid answer, but I haven't heard of anything yet. KTS and others have thought about this before. So far I think custom is the only way to go. And probably a hell alot of work too. Have you seen anything
theres a few diff ways you can go here. you can get an ARB safari snorkel and cusomize it to your rig. or you can be different, put a hat on your hood and make it seal when closed with the air intake box.