We are heading into the colder seasons of the the year. Does your vehicle's Drone noise change with air temperature?
I have been toying with the idea that the RPM and throttle setting where drone occurs could be shifted by injecting air into the exhaust with a 12 volt compressor. Water injection might work also.
Cooler exhaust gas should have a lower speed of sound, which should shift the conditions where the Drone is loudest.
Someone adventurous might also experiment with adding E85 to the fuel.
OMG, are you kidding me? You would go through all that to reduce or eliminate exhaust drone/resonance? CHANGE THE MUFFLERS or add resonators to the current setup! For the love of God!
