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Message: <blockquote data-quote="turbology" data-source="post: 539128" data-attributes="member: 10223">stig : that is different kind of formula <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Increasing the diameter of the piping will also increase the average path/cross-sectional area that the air can pass with a minute decrease in velocity. If the diameter (and hence cross-sectional area) of the pipe is increased too much, the velocity of the air flow will decrease more than the area increases, so flow would be adversely affected and power would be lost.- copy from <a href="http://www.quickhonda.net/exhaust.htm" target="_blank">http://www.quickhonda.net/exhaust.htm</a></blockquote>