Any thoughts on interesting sounding mufflers?

[Clint Beastwood]

Plugged the symposer - didn’t help much, I’m using a dB meter to figure out what frequency range I need to cancel then I’ll figure out where I can fit a side branch Helmholtz resonator.

 

[Clint Beastwood]

Rather than keep stretching this thread out while I figure out what I need to do to resolve the drone, I created a new thread http://www.fiestastforum.com/forum/threads/17035-in-progress-identifying-and-canceling-drone
where I'll document the process of trying to resolve the drone via helmholtz / 1/4 wave. Please address any drone resolution in the above listed thread.