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Helmholtz resonator is the name of what you are looking to design, and there are plenty of equations available on the web to do what you are after.

There are a lot of variables involved in calculating the appropriate chamber size to target a specific frequency, which will require very precise testing & monitoring of the exhaust. Finding the proper frequencies to target will be one hurdle, but you will also need to determine the exhaust temp (at the point where the chamber will be) and the exhaust volume I believe.

Sounds like a great project, wish I knew more to help.
 
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