What are you saying here?
I don't understand why you are bringing in formulas and assuming(grasping) at numbers, that defeats the scientific approach. The fact of the matter is that the engine is pressurized and gas will be forced out. A specific header tuned for a specific engine will definitely make more hp or move the curve somewhat, but we aren't talking nascar here. We aren't spending $1m and maxing everything to the limit for .001/sec. I'm not trying to flame, I'm just saying that $600 could be much better spent elsewhere.
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