How does an expansion chamber work?

[OldPete]

Scroll half way down this page then download and open the zip.
Reading the text will be worth the effort.
Size, shape, placement and stinger are all very important.

http://www.dansmc.com/EXHAUST_2.htm

"Oh! I knew that!"

 

[SlicerDicer]

speaking of expansion pipes.

http://www.davesmotors.com/store/product1708.html

 

[OldPete]

speaking of expansion pipes.

http://www.davesmotors.com/store/product1708.html

That has nothing to do with the OP...Thank you for sharing!