Haha, good shot at giving it a try. I had to dig pretty hard for a lot of this info, and the rest is really my best guess. There isn't a massive amount of info out there on header design to begin with and ALL of it is for 'performance' and/or racing applications. You have to take that data and try to wrangle it into some form that we can use for fuel efficiency. I hope I'm in the ballpark.
