Larry, The scenario I was talking about is high boost. The explanation that Z33 has given is right on the money. In his diagrams you can see what happens at high boost. The third diagram is the optimal. In my case I cant do that, because I have a stock GMC 302 head and the headers get in the way. Instead I have opted for the style of putting a slot on top and feeding the air through it, very similar to the Audi Diesel Lemans engine. I will post pictures of it soon.
Z33 thanks for posting the diagrams, much better explanation that I could have done.
