i did this with a phase two plenum for my ph1 and it works absolutley perfect, you will need m6 tap and a big drill bit and also somthing to router the hole to make it smooth and big enough to fit the o ring seal.if you do this then make sure you remove any swarf/debris from the inside of your inlets,not meaning to teach you how to suck eggs but a tiny bit could spell head rebulid.hope this helps mateI think the answer to that is no as well.
How about drilling a hole in a 182 plenum for the ICV?