Exhaust component supplier

[BlownMGB-V8]

The Heimholtz resonator is a dead-ended tube that is length tuned to the drone frequency. Because it is 1/4 of one wave length at that frequency it cancels the sound wave. So if the drone is at a specific rpm it is very effective.

Jim

[IaTR6]

In my case, since there is no H or X pipe before the single muffler, the Helholtz resonator needed to be after the muffler.
This is due to the frequency you are trying to cancel. Low frequencies required a larger chamber, and I didn't see that I have
the room for that-and especially since it would require two, one for each pipe. So, I still have two resonators, one for each
tailpipe, but they are in the extensions after the dual outlet muffler, and since the frequency is now higher due to the exhaust
pulses being combined in the internal "X" of the muffler, each resonator is smaller.
The conclusion I seem to be coming to is that the resonance is not confined to a specific rpm only, but begins, reaches a maximum,
and then trails off. I quieted the peak, but the rise and fall still exist. This could be cured with a variable volume resonator,
but that is beyond my willingness to try. The biggest thing about the sound, is in nice weather, with the top down, I
don't notice it as much. And, now that winter is nearly here, it won't bother me at all!
Dennis