Internal combustion engines are very sensitive to exhaust gas pressure.
In operation, the cylinders put out large pulses of pressure and want to clear
the contents of the exhausting cylinder as quickly and easily as possible.
Quality exhaust systems and mufflers are designed to minimize the
oscillations in back pressure which would interfere with emptying a
cylinder.
See: http://cafefoundation.org/v2/research_reports.php
for some specific aircraft exhaust system information
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Ira N224XS
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