Quick semi off topic question for you Gene. I was putting some new shelves in the barn today and ran across an air filter for my old (really old) truck. It's got a 327 gasser that was built up to around 300 hp. The surface area of that filter, as well as most other old carburetored gas filters I remember, is much smaller than that of the 6637. Is that just from the different BTU content of gas vs diesel?

From your posts, it seems a motor needs "X" amount of air per volume of fuel to produce that kind of horsepower. If that's the case, then fuel injectors and turbos won't have an affect on air flow required to produce a given HP. Am I comparing apples to oranges here?