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This is very interesting. In my case I have an overpowered engine (160 HP V6) for the type of driving that I do. I can get the MAP up to 29"Hg using only about 1/3 throttle in some cases. Somehow I always figured that reducing intake diameter would simply be the same as operating with less throttle. My understanding is that the engine is going to try to fill the cylinders up to whatever the displacement is. Whether air is restricted by the valves (cams), throttle, or intake piping, anything that restricts that air is going to be... Well, a restriction. And I always thought that anything that restricted exhaust lowered output and, therefore, efficiency as well. Apparently my thinking is flawed if some are seeing better numbers by actually adding restrictions.
Would anybody care to elaborate a little further on intake and exhaust tuning?
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