All stopped up

[CB4ME_imp]

Is it a helmholtz resonator?

https://en.m.wikipedia.org/wiki/Helmholtz_resonance

Interesting. From the Wikipedia entry:

"The theory of Helmholtz resonators is used in motorcycle and car exhausts to alter the sound of the exhaust note and for differences in power delivery by adding chambers to the exhaust. Exhaust resonators are also used to reduce potentially loud and obnoxious engine noise where the dimensions are calculated so that the waves reflected by the resonator help cancel out certain frequencies of sound in the exhaust."

Without the power box, the sound is less symphonic but more bad a$$.