I have the ITG cold air intake system, same as sold through Williams. Now, the theory is good but the reality ... well not quite so good!
The air filter box is mounted directly above the exhaust manifold and it gets too hot to touch, so rather than a cool air intake it would in fact make a great cold weather pre-heat system like the old cars from the 70's, 80's and into the early 90's used to pre heat the air and prevent carb icing....!