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Some people use formulas to build expansion chamber exhaust systems.  It might be interesting to use a formula which works for a two-stroke, and use it to design an expansion chamber exhaust pipe for a racing single cylinder four-stroke engine - then use a dyno to see what it does.  I think the chamber would be huge, but it might prove something.  I am very careful to avoid having steps in my exhaust system where it is attached to the cylinder head.