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I saw a neat piece on TV, Sunday. A visiting craftsman at a
flutist studio. A lovely lady instructing a gentle tattooed big guy!!
From a pair of sections of Bamboo, they created flutes. A whistle
nearest the lips, two holes! A series down pipe to be covered.
Adjusts the air column to create the notes. Dore, mi, so, etc!
Very instructive. The same principle in more complex woodwinds.
To the point, your engine will run just fine sans EGR. But, of the
emsion it is not all that bad. Allows more advanced timing by cooling the combustion...