Shins, did you ever get thay stack? You know, it seems like it would suck in a bunch of air, sticking up there, but I wonder if it would actually improve the performance that much. And here's what I mean- your engine is engineered for optimum performance (stock) at something like a 14 to 1 air/fuel ratio. When we do things that change that ratio, the engine doesn't like it and compensates by running bad. Looks like you might have to make other changes to keep up with the new air volume... now for a diesel engine, a lot of intake air is a real good thing.